Thumb Coast Ultra & Relay - 50 Mile, 50K, & 50 Mile Relay

Thumb Coast Ultra & Relay – April 25, 2026

Thumb Coast Ultra & Relay is a one-of-a-kind spring ultramarathon in Michigan’s Thumb. On Saturday, April 25, 2026, runners and ruckers will take on the challenge of racing from Lake Huron in Harbor Beach to Saginaw Bay in Caseville in the 50 Mile division—or team up with friends for the 50 Mile Relay. The 50K features a flat out-and-back course starting and finishing in Caseville.

This race offers the rare opportunity to run point-to-point across the Thumb on mostly dirt and unimproved rural roads. With just 500 feet of elevation gain in the 50 Mile and 300 feet in the 50K, it’s a course that is both approachable for first-time ultrarunners and fast enough for seasoned athletes looking to chase a personal best. Generous cutoff times allow all participants a chance to achieve their goal, while 50 Mile finishers who “beat the sun” with a daylight finish earn a unique prize in addition to their medal.

Thumb Coast Ultra & Relay is more than just a race—it’s a test of endurance, teamwork, and determination supported by a welcoming community. Participants can expect a well-marked course, fully stocked aid stations, and the camaraderie of runners, ruckers, and relay crews tackling the same adventure together.

 
Why Run Thumb Coast Ultra?

• Unique point-to-point ultramarathon from Harbor Beach to Caseville in the 50 Mile and Relay.
• Flat and fast courses: 500 feet of elevation gain (50 Mile) and 300 feet (50K).
• Relay option: Gather your crew and tackle the 50 Mile as a team.
• Ruck divisions available in both the 50 Mile and 50K.
• Generous cutoff times to support beginners and seasoned veterans alike.
• Special prize for 50 Milers who beat the sunset at the Caseville finish.
• Well-marked course with excellent aid stations, staffed by an enthusiastic volunteer crew.
• A true spring race experience in Michigan’s Thumb, just before the busy summer season begins.

50 Mile Ultra & 50 Mile Relay teams will run a point-to-point course starting in Harbor Beach, Michigan and finishing in Caseville, Michigan!  The 50 Mile course is point-to-point, starting at sunrise in Harbor Beach, Michigan and finishing on the beach at Caseville County Park.  The course consists of ~85% dirt roads, 10% paved roads, and 5% unimproved park roads (think gnarlier and sandier than dirt roads).  With ~500' elevation gain it's a gorgeous, fast course!

 

Click here to view the course on Strava.  You can view the route and elevation, as well as download a GPX file from this link to use with your GPS running watch.

 

Pre-Race Shuttle

There will be a pre-race shuttle for this event for participants who may not have a ride back to the start line.  Simply park you car at the finish line and take the shuttle to the start line before the race. Shuttle tickets will be $25.  Please sign up for the pre-race shuttle no later than April 10th.  If you have already registered for the 50 Mile but need to add on the shuttle, please see instructions here.

Shuttle Time:  5:00 am 

 

For the 50 Mile Ruck participants who are opting to begin at 4am, aid stations will not be available until times listed on the Aid Station Chart.

 

Overall and Age Group Course Records

 

Relay Rules

• 50 Mile Relay will start in Harbor Beach, Michigan and finish in Caseville, Michigan
• Team Size: 2 – 6 People (each member is required to register separately; the first team member to register will be able to create the team name. Additional members will then be able to select the relay team name during registration)
• Relay “leg” distance is up to the team, but exchanges must be done at an exchange zone only (see chart below for exchange locations)
• There is only ONE bib per relay team.  Your bib may ONLY be exchanged at the Relay Exchanges.
• Runners do not have to run an equal number of legs or distances
• All general athlete rules and gear requirements apply to relay team participants.
• Each team must provide their own support vehicle, only one vehicle per relay team. No bigger than a 12 passenger van.
• Team vehicle must have the team’s name and bib number clearly visible on 3 sides of the vehicle at all times. Front, back and one side.
• Relay team “camping” or hanging out for long times at exchange zones is not allowed. There is limited space at exchange zones, please plan accordingly.
• Vehicles supporting the relay MUST drive on alternative route provided by Trivium.  This will reduce traffic on specific race course to ensure the safety of our athletes.
• Review the Relay Guide.
• One member of the relay team MUST attend the pre-race meeting. Link will be emailed to all relay participants 1 week prior to the meeting. Attendance will be taken and penalty given if no one from relay team attends.

 

Relay exchange locations are subject to change until Feb. 2026

Click the link below to download a PDF file with live map links for the relay exchange locations AND aid station locations!

 

This out-and-back course starts and finishes on the beach at Caseville County Park.  The course uses mostly unimproved and gravel roads.  With ~220' of elevation gain it's a fun, fast race!

 

Click here to view the course on Strava.  You can view the course and elevation and download a GPX file from this link to use with your GPS running watch.

 

Overall and Age Group Course Record Holders

This is a cup-less event.  You will be provided a collapsible cup at packet pick up to use at the aid stations if you will not be using your own hydration source.

Note: Aid Stations locations and options available may change slightly due to course modifications and availability.

All stations will include water, Tailwind as well as food options. Check out the chart below to view 2025's aid station offerings, 2026 offerings will be similar, but finalized January, 2026.

 

Aid Station information updated April 15,2025.

Click the link below to download a PDF file with live map links for the aid station and relay exchange locations!

Michigan

Mega Medal Series

Prove It 5K/10K:  April 18, 2026 at the GM Milford Proving Ground in Milford, Michigan

Trenton Summerfest Half Marthon, 8K, & 5K:  June 27, 2026 at Elizabeth Park in Trenton, Michigan

Dearborn Decades 5K:  August 9, 2026 at Ford Field Park in Dearborn, Michigan

Run the 313 5K:  August 22, 2026 at Palmer Park in Detroit, Michigan

Growler Gallop Atwater 10 Mile & 5K:  September 27, 2026 at Atwater Brewery in Detroit, Michigan

Black Toenail Friday Half Marathon & 7.5 Mile:  November 27, 2026 at Proud Lake Rec Area in Commerce Township, Michigan

 

Trail

Winter Trail Fest (WTF) East Half Marathon & 5 Mile:  February 14, 2026 at Island Lake Rec Area in Brighton, Michigan

Winter Trail Fest (WTF) West Half Marathon & 5 Mile:  February 21, 2026 at Yankee Springs Rec Area in Middleville, Michigan

Carpe Diem Carpe Noctem Morning & Evening Half Marathon & 10K:  April 11, 2026 at Proud Lake Rec Area in Commerce Township, Michigan

Summer Trail Fest Ultra (STFU) 50 Mile, 50K, Half Marathon, & 5 Mile:  June 13, 2026 Sleepy Hollow Rec Area in Laingsburg, Michigan

Moonlight Bootlegger 5k:  May 9, 2026 at Maybury State Park in Northville, Michigan

Wolverine State 100 100M, 100K, 100M Relay, & 50K:  October 10-11, 2026 from Petoskey to Alpena in Northern Michigan

 

Road

Thumb Coast Ultra & Relay 50M, 50K, & 50M Relay:  April 25, 2026 from Harbor Beach to Caseville in Michigan's Thumb

Rock CF Thumb Coast Marathon, Half Marathon, & 5K:  November 8, 2026 from Caseville to Port Austin in Michigan's Thumb

 

North Carolina

Road Mega Medal Series

Only Fools Run Half Marathon, 10K, & 5K:  March 28, 2026 at Jaycee Park in Greensboro, North Carolina

Pig Pounder Brewery 5K:  April 12, 2026 at the Pig Pounder Brewery in Greensboro, North Carolina

Elm Street Run Festival:  May 9, 2026 at LeBauer Park in downtown Greensboro, North Carolina

Greensboro Distilling Speakeasy 5k:  June 13, 2026 at Greensboro Distilling Co. and SouthEnd Brewing in Greensboro, North Carolina

Greensboro Half Marathon, 5K, & 1 Mile:  November 21, 2026 starting at Battleground Ave in Greensboro, North Carolina

 

Trail Mega Medal Series

Whiskey Tango Foxtrot Half Marathon & 5 Mile:  January 17, 2026 at Northeast Park in Gibsonville, North Carolina

Northern Trails 17 Mile, 10 Mile & 5 Mile:  March 7, 2026 at Northern Guilford High School in Greensboro, North Carolina

Owls Roost Rumble Half Marathon & 4 Mile:  April 25, 2026 at Bur-Mil Park in Greensboro, North Carolina

Triple Lakes Trail Race 40 Mile, Marathon, & Half Marathon: October 24, 2026 at Bur-Mil Park in Greensboro, North Carolina

Black Toenail Friday Half Marathon and 7.5 Miler: November 27, 2026 at Snow Camp, North Carolina

 

Multisport Mega Medal Series

Belews Lake Sprint Triathlon & Duathlon: April 18, 2026 at Belews Lake Marina in Stokesdale, North Carolina

Big Mack Sprint Triathlon:  June 20th, 2026 at Lake Cammack in Burlington, North Carolina

High Point Sprint Triathlon:  August 8, 2026 at Oak Hollow Marina in High Point, North Carolina

Belews Lake Olympic Triathlon & Duathlon:  September 12, 2026 at Belews Lake Marina in Stokesdale, North Carolina

Nat Greene's Revenge Triathlon & Duathlon: October 3, 2026 at Lake Brandt Marina in Greensboro, North Carolina

 

Multisport

Northeast Park Duathlon:  February 28, 2026 at Northeast Park in Gibsonville, North Carolina

 

Trail

Groundhog’s Lap Race: January 31, 2026 at Haw River State Park, North Carolina

Moonlight Bootlegger 5K:  May 2, 2026 at Hagan Stone Park in Pleasant Garden, North Carolina

Carpe Diem Carpe Noctem Morning & Evening Half Marathon & 10K:  September 12, 2026 at Hagan-Stone Park in Pleasant Garden, North Carolina

Pilot Mountain to Hanging Rock Ultra & Relay:  September 19, 2026 in Danbury, North Carolina

 

Road

Running of the Lights:  January 1st at Tanglewood Park in Clemmons, North Carolina

Blackbeard's Revenge 100 Ultra & Relay 100M, 100K, & 100M Relay:  March 21-22, 2026 in the Outer Banks in Corolla, North Carolina

 

Pennsylvania

End of the Road Half Marathon & One Tunnel 4 Mile:  October 24-25, 2026 on the old Pennsylvania Turnpike in Waterfall, Pennsylvania

 

West Virginia

Highball to Thurmond Ultra & Relay 50M, 50K, & 50M Relay:  May 17, 2026 in New River Gorge National Park, running from Montgomery to Thurmond, West Virginia

We will be releasing the 2026 athlete guide soon! See the 2025 Athlete Guide to provide you with helpful information as you plan.  As the race gets closer, the Athlete Guide will be updated frequently.  

Last Modified: 12/22/2025

We will have a bag check area at the start of both races and at the packet pick up on Friday, April 24th. A bag to use for bag check will be provided to all athletes at check in. For security reasons, this is the only bag that will be allowed to be left at bag check.

• For the 50 Mile runners, the Drop Bags will be brought to Aid Station F which is mile 30.32 on the course.
• For the 50K runners, the Drop Bags will be taken to Aid Station G which is mile 15.5 on the course and your turnaround location.
• The 50 Mile runners will also get a finish line drop bag that will be taken back to the finish line for you once you have completed the race!

Drop bags will be brought back to the finish periodically throughout the event however they won't be guaranteed to the finish until the Aid Station is "closed" for the race.

Start/Finish Lines

• Start Line for 50 Mile: Judge James H. Lincoln Memorial Park, 1 Trescott St, Harbor Beach, MI 48441
• Start/Finish Line for 50K (and 50 Mile Finish): Caseville County Park, 6400 Main St, Caseville, MI 48725

Packet Pickup

Friday, April 24th at Thumb Brewery, 2pm-7pm:  6758 Pine St, Caseville, MI 48725

Virtual Clinics w/ Race Director & TWB Coach Caleb

 

Virtual Clinic #1: December 2, 2025 at 7 pm EST:

Meet our coaches to learn more about the training plans and ask questions as you begin your official Thumb Coast training!  A Thumb Coast Race Director will also be joining the clinic to answer questions about race weekend.  Open to registered participants and those interested in registering.

RSVP & Submit Questions:  https://forms.gle/qSRcrKxL62mjK5HQ6

Join the Clinic on Google Meet:

Video call link: https://meet.google.com/gkn-zvvu-qmt
Or dial: ‪(US) +1 402-971-0096‬ PIN: ‪981 842 072‬#
More phone numbers: https://tel.meet/gkn-zvvu-qmt?pin=4377614995870

 

Virtual Clinic #2: April 7, 2026 at 7 pm EST

Coach Caleb will discuss the taper phase and answer any questions you have for your coach as you prepare for race weekend!  A Thumb Coast Ultra Race Director will also be joining to answer race weekend questions.

RSVP & Submit Questions:  https://forms.gle/9p3ow8Zh5Gqye5E97

Join the Clinic on Google Meet:

Video call link: https://meet.google.com/ysk-fxxs-iit
Or dial: ‪(US) +1 636-591-1451‬ PIN: ‪318 447 619‬#
More phone numbers: https://tel.meet/ysk-fxxs-iit?pin=1632121830808

 

Mandatory Virtual Pre Race Athlete Meeting

TBA

 

Friday, April 24th:

• Packet Pickup at Thumb Brewery, 2pm-7pm:  6758 Pine St, Caseville, MI 48725

 

Saturday, April 25th: 

• 50 Mile Ruck Weigh In:  4:40 AM in Harbor Beach
• Start Time: 50 Mile Ruck - 5:00 AM in Harbor Beach MI- Note, aid stations will not be available until prescribed times.
  • This start time is allowed for participants rucking the 50 Mile.  You must be rucking the event to begin early and will not be eligible for specific overall awards.
• Race morning 50 Mile packet pickup: 5:00am-6:10am in Harbor Beach
• Start Time: 50 Mile - 6:47 AM in Harbor Beach (Sunrise)
• Race morning 50K packet pick up: 6:30 AM -8:00 AM in Caseville
• 50K Ruck Weigh In:  7:10 AM in Caseville
• Start Time: 50 Kilometer Ruck - 7:30 AM in Caseville
• Start Time: 50 Kilometer - 8:30 AM in Caseville
• Special award 50 Mile Individual Cutoff: 8:31 pm Caseville (Sunset)
• All Participant Cutoff: 9:40 pm Caseville

What is Thumb Coast Ultra?

Thumb Coast Ultra & Relay is a point-to-point ultramarathon across Michigan’s Thumb, held on Saturday, April 25, 2026. Runners take on dirt and paved paved backroads and unimproved roads from Harbor Beach to Caseville. This spring race is scenic, flat, fast, and beautiful—perfect for both first-time ultrarunners and seasoned endurance athletes.

 

What distances are offered?

• 50 Mile: Point-to-point from Harbor Beach to Caseville
• 50K: Out-and-back from Caseville
• 50 Mile Relay: Teams of up to 6 runners split the full 50-mile course

 

How difficult is the course?

Thumb Coast Ultra is one of Michigan’s flattest ultramarathons, with gentle rolling terrain and minimal elevation gain. Most of the route follows dirt and paved rural roads with views of open farmland and Lake Huron. The race also spends time on unimproved roads.  Some runners prefer road shoes; some trail.  Runners should expect steady weather exposure—bring layers for wind and sun protection. 

 

Is this a road or trail race?

This is primarily a road ultramarathon. The course uses paved and lightly traveled dirt backroads connecting small lakeside communities with some portions on unimproved dirt roads, particularly in the 50K. It’s ideal for runners looking for a fast course or their first ultra without highly technical trail sections.  Shoe choice is entirely your choice, but most 50 Mile runners opt to at least start in road shoes.

 

What’s included with registration?

All participants receive:

• A race jacket
• A gorgeous finisher medal
• Bumper sticker
• Reusable cup
• Fully stocked aid stations with hydration, electrolytes, and ultra-fueling real food favorites
• Post-race celebration at the finish line in Caseville - 2025 included cook to order breakfast!
• Chip timing by Trivium Racing
• Free race photography

 

Are there official training plans?

Yes! Official Team Wicked Bonkproof training plans are available for both the 50 Mile, 50K, and Relay distances, designed by Coach Caleb. These structured plans begin with an 8-week base-building block (optional) before the official race plans kick off, helping you arrive strong and prepared.

 

Is there a relay option?

Yes! The 50 Mile Relay allows up to six teammates to share the full distance. Each runner completes one or more segments, handing off at designated exchange points along the course. It’s perfect for running clubs, friends, or coworkers who want to experience the ultra together.  Check out the Relay Guide.

 

What’s the elevation gain?

The 50 Mile course features only ~500' of elevation gain—a few small rises, but no major climbs. The 50K course, which starts and finishes in Caseville, is also flat and fast, featuring only ~220' of gain. This makes it a great choice for ultrarunners chasing a PR or stepping up in distance for the first time.

 

What time does the race start?

The 50 Mile starts at sunrise in Harbor Beach and the 50K starts at 8:30 am.  The 50M ruck starts at 5:00 am and the 50K ruck starts at 7:30 am.  Check the event schedule page for full details.

 

Where is the start and finish line?

• 50 Mile Ultra & Relay: Start in Harbor Beach, finish in Caseville
• 50K Ultra: Start and finish in Caseville

Caseville serves as the hub for race weekend, hosting packet pickup and the post-race celebration.  Check out all the important event locations here.

 

Will there be aid stations?

Yes. Aid stations will be placed approximately every 5 miles, stocked with water, Tailwind, fruit, pretzels, chips, Hüma gels, real food, bacon, candy, and other snacks. Check out the full Aid Station chart here.

 

Is there a time limit?

Yes. Runners have a generous cutoff of 14:53:00 for the 50 Mile race and 13:10:00 for the 50K. Relay teams must also meet the 50 Mile cutoff.  There are also cut offs at certain aid stations that you must meet.  Check those out on the Aid Station Chart.

 

Can I have a crew or pacer?

Yes! Pacers are welcome in both distances at any time as long as they're registered and follow the same rules as the athletes.  They can register and read the rules here.  Crews are welcome as long as they follow the rules, particularly that only one vehicle is allowed on course per athlete and bikes may not pace athletes.  Please see the Athlete Guide.

 

Is there race-day parking and transportation?

Yes. Parking is available near the 50K start/finish, which is also the 50 Mile finish. Shuttle options will be available for 50 Mile participants and relays from the finish line in Caseville to the start line in Harbor Beach.  Read here for more shuttle details.  There is no shuttle from the finish line back to the start in Harbor Beach.

 

Where can I register?

Register now online to secure your spot and guarantee your jacket size. Registration closes the night before race day.  There is no on site registration.

 

Can I volunteer?

Absolutely! Ultra races thrive on community support. Volunteers receive a volunteer shirt, the option of a future Trivium Racing race credit or a donation to a group, and major gratitude from our runners. You can sign up to volunteer here!  Contact Cathi at cathi@triviumracing.com with any questions.

 

Who produces the race?

Thumb Coast Ultra is proudly organized and timed by Trivium Racing, known for creating memorable, community-driven races across the Midwest and East Coast. Other Trivium ultras include Wolverine State 100, Highball to Thurmond, Blackbeard’s Revenge 100, Summer Trail Fest Ultra, and Pilot Mountain to Hanging Rock.

 

Why should I run Thumb Coast Ultra?

It’s a road ultra with heart—flat, friendly, and full of small-town charm. It’s your chance to run across Michigan’s Thumb, powered by community, Lake Huron views, and a finish line celebration that makes every mile worth it.

 

I don't think I'm getting your emails.

We send a comfortable amount of emails; we want our runners to be informed and safe.  If you haven't received one from us in over a month, especially if we're three months or less out from race day, you may be missing them.

• Have you checked your Spam folder?
• Have you check other folders your email provider "kindly" created for you and "conveniently" filters your mail into, like Promotions, Purchases, Updates, etc.?
• Have you added "noreply@runsignup.com" to your contacts?

If you've done all of this and want us to send you a test email, email Cathi at cathi@triviumracing.com.

 

Can I switch distances?

Yes! You can transfer from the 50 Mile to 50K (or vice versa) through your RunSignup account up until race week. Any difference in registration fees will apply.  Instructions on how to transfer.

 

Can I change the size jacket I ordered?

You can change your jacket size by following these instructions. Keep in mind that some sizes may sell out within 2 weeks of race day.

 

Can I add a buff, shirt, etc. to my registration after I’ve already registered?

Just follow these instructions to add the item or update your add on options. Although some options may only be available until a certain date, most can be updated up to a week before the event.  Most swag will be available for purchase at packet pickup, but sizes will be limited.

 

Do you offer refunds or deferrals?

Refunds: No refunds for any reason will be issued for this event within 30 days of the event start date. Earlier than 30 days before the event, a request may be made for a 50% refund (this will be 50% of entry fee, excluding any processing fees).

Deferrals: Entries CANNOT be transferred or deferred to another event or year. NO EXCEPTIONS will be made to this policy.

 

Can someone else pick up my packet?
Yes—just make sure they bring a copy of your confirmation email.

The Thumb Coast Ultra ends in the home of one of Michigan's most popular beaches, Caseville.  Visit the Caseville Chamber of Commerce page for more information on places to eat, accommodations, and more.  Also please remember to check out Airbnb and VRBO for openings.

 

Fort Wilderness RV & Campground has 15 spots available at 7671Crescent Beach Rd., Pigeon, MI.  For reservations, call 989-445-0637 or email: sward21@verizon.net.  Per State of Michigan law, only one family is allowed per site.

• $19/spot- Thumb Coast Ultra Special price
• No showers or electricity as this is a wilderness campground.
• Portables available
• City water available

Fox's Lodge at Oak Pointe Bed and Breakfast is located in Caseville at 5857 Port Austin Road, Caseville, MI 48725, two miles from the 50K start/finish and 50M finish.  They serve an early breakfast on race day, accommodating the different start times and honor any dietary restrictions.  Enjoy their fresh out of the oven muffins upon arrival!  Additionally, Fox's Lodge is open year-round.  Enjoy a weekend away in the Thumb and log some miles on the race course ahead of time.

 

If you want to stay closer to the 50 Mile start, check out the Harbor Beach Inn.

All athletes may have pacers and crew. Please check out the rules associated with pacers and crew for this event. Athletes are responsible for their crew.  If the crew or pacer does not follow the rules the athlete will be penalized. 

• Each athlete is allowed one support vehicle, we do not want to overcrowd the course. This vehicle cannot be an RV or van larger than 12 passenger.
• While support vehicles are allowed to carry and supply gear at aid stations, they may not pace the athlete.
• No aid or pacing from moving vehicles or bicycles.
• Support vehicles must have their racer’s or team’s name and bib number clearly visible on the vehicle at all times. We will provide signage at packet pick-up if needed.
• Pacers are allowed from the beginning of the race on, but only one pacer is allowed at any given time.
• Pacers MUST wear a pacer bib (will be included with participant bib at packet pick-up) while on the course and pre-sign the waiver (available at the link below).
• Much of the course has rules about parking, please adhere to them.
• Pacers, please be aware that the course fuel and food is for the athletes racing, while you are allowed to have some, please try to supply as much of your own as possible.
• If your athlete drops out of the race please follow proper procedure by checking in at the closest manned aid station and turning in their race bib.

All pacers must register here by April 25 to receive a pacer bib.

Pacers and Crew, please review pages 11-12 of the Athlete Guide.

"The aide stations were perfectly stocked. Just enough, but not too many options. Always a sweet & a savory, and the Tailwind is always a win.  The aide workers were kind & knowledgeable. The race course was gorgeous (okay the sand was rough at the end, but in a good way!), and the sunrise to sunset challenge was AMAZING.  Y'all are doing an incredible job, and I'm just really happy to have taken part! We'll be back next year and I'm taking a look at your other races :)" - Eleanor K., 2025 Participant

 

"The aid station volunteers were SO amazing and friendly, as were other racers. It felt more like a team out to accomplish a goal rather than a competition!  This was my first ultra race and at times I felt like I wasn't going to be able to finish it out, but the support from total strangers went a long ways!" - Maggie H., 2025 Participant

 

"I only signed up a week before, but received plenty of information about the race and was well prepared. The race was very well organized and staffed. Medals and plaque were awesome!" - Joey K., 2025 Participant

 

"I've participated both years, and even having not-so-perfect weather both times, it's still an amazing experience I can't stop smiling about!" - Becky K., 2025 Participant

 

"Of all the ultras I have run, this was the most organized and thoughtful. It was so kind of you to have pre race meetings for athletes to ask questions. Allowing pacers any time is a very nice option that I haven't seen before. It is a great help to those new to running longer distances. The signage was fantastic!" - Elizabeth E, 2024 Thumb Coast Ultra participant

 

"It was very well organized, the course was beautiful and so easy to follow, and there were plenty of aid stations. Thank you so much for having such awesome events!!!" - Jaimie K., 2024 Thumb Coast Ultra participant

 

"You did an amazing job with this race, and from talking to friends and fellow runners I’m not alone with this opinion. The communication was exceptional and made it easy for us out of towners to prepare for the weekend. The medal and jacket are really nice. Two thumbs up, can’t wait for next year!" - Daniela S., 2024 Thumb Coast Ultra participant

 

"The start and finish are both so pretty! I love the flat course and the pretty trails- the sun medal is awesome!!" - Jessica R., 2024 Thumb Coast Ultra participant

 

"Very well supported course. Great communication from pre-race to race day, well supported aide with extremely helpful volunteers. The port-a-potties we VERY appreciated!!" - Liz C., 2024 Thumb Coast Ultra participant

 

"Great volunteers, the Caseville community was amazing and the race directors were awesome." - Sarah A., 2024 Thumb Coast Ultra participant

 

"I loved the relay and all the support and aid stations." - Holly W., 2024 Thumb Coast Ultra participant

 

"One of the most organized runs I have participated in. Thank you for having a charge for each runner on a relay team instead of one cost. Made it much more feasible for all. And wow the jacket swag is awesome! I believe you really know how to do these runs and I am going to look for other runs you organize. Incredible crew! The wind was a beast but the organization of the race made it doable! The volunteers were the best at cheer leading such a friendly bunch!" - Anonymous 2024 Thumb Coast Ultra participant

 

"Everything. Trivium was very well prepared, did a great job of communicating and everything was superb. You couldn't do anything about the weather. It was evident that a lot of work and planning went into this race. I would have stayed longer if I wasn't completely wrecked." - Doug M., 2024 Thumb Coast Ultra participant

 

"Loved the energy of all the runners and sharing the road with them." - Anonymous 2024 Thumb Coast Ultra participant

 

"VERY WELL put on and organized. Easy packet pickup, lots of instruction to make the relay simple for us. Great gear. It was an amazing day. I was so impressed with this race. I’m from harbor beach and have ran a lot of races in my years and this was the best put on race in the county. Keep it up!" - Allison G., 2024 Thumb Coast Ultra participant

 

"This is one of the only ultras that makes ruckers feel welcomed. We do running sometime but the option to ruck was very appreciated." - Dave W., 2024 Thumb Coast Ultra participant

 

"The communication was phenomenal, the volunteers were very kind, and the camaraderie was great!" - Anonymous 2024 Thumb Coast Ultra participant

 

"The medals and jackets were awesome!" - Kristin K., 2024 Thumb Coast Ultra participant

 

"The total vibe of the race was awesome. everyone seemed excited to go on this epic journey. You did a fantastic job! The aid station volunteers were great. The pre-race communications and online meetings were great. It greatly exceeded my expectations for a first-year race. Thanks for making this happen!" - Bob S., 2024 Thumb Coast Ultra participant

 

"This is a great race. Really flat course overall. It was a lot of fun, very well organized and the volunteers were great." - Laura P., 2024 Thumb Coast Ultra participant

 

"Well organized, great aid stations, and great support staff" - Anonymous 2024 Thumb Coast Ultra participant

 

"Fun atmosphere, affordable off-season trip" - Davita B., 2024 Thumb Coast Ultra participant

 

"I was very impressed with this race and the organization. The pre-race meetings were helpful and it seemed like your team really took the feedback into consideration. I felt I received a lot of value out of the cost for the race. It was really cool having local sponsors like Thumb Brewing and local shops." - Joey K., 2024 Thumb Coast Ultra participant

 

"The aid stations had a great selection of food and drinks. The race volunteers were super helpful. The beat the sunset mug was amazing and the medal is one of the best medals I have in my collection." Mike G., 2024 Thumb Coast Ultra participant

 

"Could not have been better organized! Staff and volunteers were all amazing and so supportive and helpful! Course was marked great!" - Lani F., 2024 Thumb Coast Ultra participant

 

"The vibe was good, and the people were cool" - Nathan N., 2024 Thumb Coast Ultra participant

 

"Race directors were great! So helpful and accommodating." - Anonymous 2024 Thumb Coast Ultra participant 

 

"Well run, started right on time, all question’s answered, course clearly marked (huge one), aide stations where good" - Abe K., 2024 Thumb Coast Ultra participant 

 

"I enjoyed running the relay with a team, which allows more people to run that might not be able to finish 50 miles solo. I enjoyed the great turnout and how many people were on the trail." - Graham K., 2024 Thumb Coast Ultra participant 

 

"Thank you for a FUN event!! The medals and jackets were Awesome!!!" - Nikki H., 2024 Thumb Coast Ultra participant 

 

"Beautiful course, very organized, positive people all around!" - Lisa M., 2024 Thumb Coast Ultra participant 

 

"Great communication throughout the event. Great volunteers." - Charles J., 2024 Thumb Coast Ultra participant 

 

"Cool concept racing across the thumb/beating sunset. First ultra in the Thumb as far as I know. Very well marked, professional quality race experience." - Marty R., 2024 Thumb Coast Ultra participant  

 

"Race course wasn't too hard. Everyone was friendly. Lovely location." - Anonymous 2024 Thumb Coast Ultra participant  

 

"The wind, sand and well organized race with excellent communications, excited volunteers and great aid stations. Great job Trivium! Far exceeded my expectations. We knew that mid April in Michigan could be eventful and it was! “Is that snow”? “Ummm I think so” Thanks volunteers and staff you all were amazing" - Jason S., 2024 Thumb Coast Ultra participant  

 

"The atmosphere was great. Thank you so much for bringing this to the area. It was well run and was a great event." - Jim N., 2024 Thumb Coast Ultra participant  

 

"All of the volunteers, the snacks at the end of the race and the free stretching/massage service. I liked all the pre race meetings to clear up questions" - Anonymous 2024 Thumb Coast Ultra participant  

 

"Volunteers did a great job. Race was well organized and communication with participants was thorough. I think novice runners appreciated the level of communication from RDs and the amount of aid/accessibility to crew." - Anonymous 2024 Thumb Coast Ultra participant  

 

"It was well organized, everyone had good energy. Thank you! Really excited to have an event like this in the thumb!" - Anonymous 2024 Thumb Coast Ultra participant

 

"This was my first time doing ultra relay! Fun times! I will do it again!" - Anonymous 2024 Thumb Coast Ultra participant  

 

"I enjoyed the friendly volunteers, the residents of the towns, the local companies, and the fact that I PR’d!" - Sunnie F., 2024 Thumb Coast Ultra participant

 

"It was well organized and all the staff and volunteers were so helpful, encouraging, and friendly! I really loved the placement of the aid stations! They were just the right distance to work perfectly." - Joseph M., 2024 Thumb Coast Ultra participant

 

"We had a blast. Thank you for planning and executing such a fun weekend! Thanks to the towns for welcoming us into their cute communities. We also appreciated the conference calls, emails, social media updates. You all did great!!" - Evelyn T., 2024 Thumb Coast Ultra participant

 

"Very organized, great aid stations and awesome volunteers. Kudos to everyone!" - Kendra T., 2024 Thumb Coast Ultra participant

 

"Great job on the first year! As a Thumb area resident I am really happy to see an event like this in our area! Keep it going!" - Anonymous 2024 Thumb Coast Ultra participant  

 

"Very well organized and excellent communication!" - Kali F., 2024 Thumb Coast Ultra participant

 

"I would love to shout out the training plans the coaches, Caleb Masland, provided! As a first time 50 miler the training plan was fantastic. I have never used a coach and I would 100% pay for this again! I felt well trained and I recovered so well between the easy and hard efforts. I followed the plan from day one to race day and never missed a workout! I questioned some days after back to back long run or speed work/hills whether I could do the next days workout but somehow I was ready to go by the next day. Pure Magic! Loved it! I felt confident and totally prepared to run 50 miles. This is something I would make sure to offer again as it was so beneficial to me completing my first 50 miler! Thank you again!" - Carrie W., 2024 Thumb Coast Ultra participant

 

"The entire event was well run and the town of Caseville did a great job helping the runners feel welcome. We were able to get into town early enough on Friday to eat at the Brewery and enjoyed a pizza after the race from the place by the park." - Dana M., 2024 Thumb Coast Ultra participant

 

"Very good experience. I would recommend this event to anyone considering doing an ultra whether it's your first or fiftieth." - Anonymous 2024 Thumb Coast Ultra participant  

 

"The people - race coordinators, volunteers, racers, everyone was so friendly! The relay legs were well planned, the exchanges were organized, the finish was very cool. You guys are the best! It was such a fun race weekend!" - Anonymous 2024 Thumb Coast Ultra participant  

 

"Loved this whole concept of racing the sun and running in a beautiful area. The Thumb is awesome. The organizers are awesome people and the whole vibe of race weekend was fun, kind and caring. Really enjoyed myself despite the killer wind (which is obviously totally out of their control and made it more bada$$)" - Wendy, 2024 Thumb Coast Ultra participant  

 

"Thank you for a great event! The people. The racers, the staff, the volunteers, the spectators and the sponsors. A marvelous collaboration of efforts that contributed to an amazing and memorable event. The organization of the event from the day I signed up all through race day was very well executed." - Josh D., 2024 Thumb Coast Ultra participant  

 

"Overall, I was very impressed with my experience to complete my first 50 mile run. Outstanding job to all of those involved in making it a success. The help and support from all the volunteers and Thumb Coast crew. The race medal, jacket, and mug (my coffee never tasted so good!) are awesome. The race day photos were a nice surprise (I didn't realize they were included with registration)." - Branson H., 2024 Thumb Coast Ultra participant  

 

"It was a super fun course and obviously the people running and volunteering were awesome!" - Emily W., 2024 Thumb Coast Ultra participant  

 

"I participated in the relay, which was very well organized, any place we stopped people were welcoming and excited for us. A great vibe" - Rebecca O., 

2024 Thumb Coast Ultra participant  

 

"All the runners, staff and volunteers were friendly and eager to help. Beautiful scenery, ample time finish and a feeling of belonging regardless of ability." - Randy W., 2024 Thumb Coast Ultra participant  

 

"It was very well organized, loved supporting the local businesses, aid stations were well stocked, pre race meetings were great! Course was well marked." - Anonymous 2024 Thumb Coast Ultra participant  

 

"Loved the challenge to beat the sunset. This gives a lot of back of the pack runners a special accomplishment!" - Anonymous 2024 Thumb Coast Ultra participant  

There will be a shuttle for the 50 Mile participants who may not have a ride to the start line!

• Park your car at the finish line in Caseville and take the shuttle to the start line in Harbor Beach before the race.
• Shuttle tickets are $25.
• Sign up for the race shuttle no later than April 10th.  If you have already registered for the 50 Mile event but need to add on the shuttle, please see instructions here.
• Shuttle Time: 5:00 am
• If you do not pick up your drop bags and bib on Friday, April 24th, please pick them up at check-in prior to getting on the shuttle.  Staff will be onsite at Caseville County Park to check you in.  You can then pack your drop bags while waiting and while on the bus and give them to race staff at the 50 Mile start.
• There is no shuttle from the finish line in Caseville back to the 50 Mile starting line in Harbor Beach.

Thumb Coast Ultra & Relay offers a referral refund program. This is a fun & easy way to get your friends, teammates, family, or coworkers to sign up to race with you.  Bonus:  You get a little money back on your registration fee!

Referral Incentives:

• 50 Mile, 50K, 50 Mile Relay, 50 Mile Ruck, & 50K Ruck:  Refer 5 people who sign up to race and you get a $20 race registration refund.
• Does not apply to virtual events and cannot be applied retroactively.

How Does It Work?

Share your specific referral code link that came in your original registration confirmation email.  Once you get the above-mentioned people to register using your code, you'll get your registration refund. Start sharing your link today!

You can also locate your personal referral link in your RunSignup account by clicking this link for instructions.

With the overwhelming response for Relay teams for the Thumb Coast Ultra event, we are enforcing specific rules for relay teams to ensure the safety of all our participants.  This will include a specific driving route for relay teams.  If you are caught driving on the official race course, the team will be penalized.  For more information regarding the Relay Rules and Driving Route, please see the Relay Exchange Guide below.  

 

Updated: April 17, 2025

Those wishing to race in the ruck category must provide their own pack/vest and weight. Ruckers and their packs/vests will both will be weighed before the race start.

• Ruckers under 150 lbs must have a pack/vest with 20 lbs
• Ruckers over 150 lbs must have a pack/vest with 30 lbs

 

Additional Rules:

• Ruck weight must be on the athlete at all times.
• No specific pack/vest is required.
• Ruck weight may be a combination of the pack and the weight.
• Ruck weight may not be consumable, i.e. water and food carried does not count as the ruck weight.

 

If you would like more information about rucking, click here.

 

All finishers will receive a finisher's medal and there will be a special award for the individual 50 Milers who "beat the sun" and cross the finish line before 8:31 PM ET.  

Overall and age group awards listed below will be presented on a rolling basis throughout the event.

Age Group Awards: 

• 50 Mile Awards: The top 3 men, women & non-binary overall, along with the top 3 men and women in each of the following age groups: 19 and under, 20-29, 30-39, 40-49, 50-59, 60-69, 70-79, 80+ will receive awards.
• 50K Awards: The top 3 men, women & non-binary overall, along with the top 3 men and women in each of the following age groups: 19 and under, 20-29, 30-39, 40-49, 50-59, 60-69, 70-79, 80+ will receive awards.
• 50 Mile Relay: Top 3 relays in the following categories: Overall Men's, Overall Women's, Overall Coed (requires at least 2 females)

Virtual participants will not be eligible for awards.

Awards not picked up on race day will be subject to a $10 shipping fee. Awards will only be mailed 2 weeks from the event date.

This is a chip timed event by Trivium Racing.

 

 

Official Thumb Coast Ultra & Relay training plans are designed by Coach Caleb and his Ironroot Distance (formerly TWB) team!

• Pre-training block plan:  8 weeks, starting October 13, 2025. Build a base before "official" training starts!  $20.
• Ultramarathon plans:  20 weeks, starting December 8, 2025.  $35.
• Relay plans:  12 weeks, starting February 2, 2026.  $25.

 

You can purchase a plan directly through Team Wicked Bonkproof's website HERE.

After you purchase a plan you'll receive an email from Coach Caleb with instructions to add the plan on TrainingPeaks. As soon as that is done, the plan is added to your calendar.

 

Plans Include:

• Choice of Easy or Advanced 50 Mile or 50K Plan (20 weeks) or two options for relay runners (12 week plans)

• Your training plan uploaded to the online platform, Training Peaks, where you have the option to download workouts to your Apple Watch or Garmin.

• Opportunity to upgrade to personalized coaching with Coach Caleb or Coach Johnny with a $25 monthly discount for the first three months.

• Two Zoom training clinics with Coach Caleb and the Thumb Coast Ultra & Relay team.

 

Virtual Clinic Dates:

Virtual Clinic #1: December 2, 2025 at 7 pm EST:

Meet our coaches to learn more about the training plans and ask questions as you begin your official Thumb Coast training!  A Thumb Coast Race Director will also be joining the clinic to answer questions about race weekend.  Open to registered participants and those interested in registering.

RSVP & Submit Questions:  https://forms.gle/qSRcrKxL62mjK5HQ6

Join the Clinic on Google Meet:

Video call link: https://meet.google.com/gkn-zvvu-qmt
Or dial: ‪(US) +1 402-971-0096‬ PIN: ‪981 842 072‬#
More phone numbers: https://tel.meet/gkn-zvvu-qmt?pin=4377614995870

 

Virtual Clinic #2: April 7, 2026 at 7 pm EST

Coach Caleb will discuss the taper phase and answer any questions you have for your coach as you prepare for race weekend!  A Thumb Coast Ultra Race Director will also be joining to answer race weekend questions.

RSVP & Submit Questions:  https://forms.gle/9p3ow8Zh5Gqye5E97

Join the Clinic on Google Meet:

Video call link: https://meet.google.com/ysk-fxxs-iit
Or dial: ‪(US) +1 636-591-1451‬ PIN: ‪318 447 619‬#
More phone numbers: https://tel.meet/ysk-fxxs-iit?pin=1632121830808

 

50 Mile & 50K Training Plan Options (20 Weeks):

50k Easy Plan - 20 Weeks: This is intended for someone training to complete their first 50k. It's recommended that runners are able to run 10-12 miles at once before starting this program. Long runs will begin around 12 miles and build to 25-27 miles. There will be a couple of weeks that will feature 2 longer runs on back-to-back days. This plan will recommend 4 days of running per week (with the option for added mileage).

50k Advanced Plan - 20 Weeks: This is intended for someone experienced at marathons or ultramarathons who has a goal of training for a personal best (for the course or distance). Long runs will begin around 16 miles and build to 27-28 miles in a single session. There will be a number of weeks that will feature 2 longer runs on back-to-back days. Based on the course profile, emphasis will be placed on building speed on flatter terrain. This plan will recommend 5-6 days of running per week.

50-Mile Easy Plan - 20 Weeks: This is intended for someone training to complete their first 50-miler. Due to the added length of the 50-mile distance, it is recommended that runners have completed a marathon previously before tackling this plan. In the absence of a marathon, runners should be comfortable with runs of 18-20 miles before tackling this plan. Long runs will begin around 15 miles and build to 30 miles in a single session There will be a number of weeks that will feature 2 longer runs on back-to-back days. This plan will recommend 5 days of running per week (with the option for added mileage).

50 Mile Advanced Plan - 20 Weeks: This is intended for someone experienced at ultramarathons who has a goal of training for a personal best (for the course or distance). Long runs will begin around 20 miles and build to 31-32 miles in a single session. There will be a number of weeks that will feature 2 longer runs on back-to-back days as well as medium-long runs in the middle of most weeks. Based on the course profile, emphasis will be placed on building speed on flatter terrain. This plan will recommend 6-7 days of running per week.

 

Relay Training Plans (12 Weeks):

50-Mile Relay 4+ Member Team Plan - 12 Weeks: This training plan is intended to prepare runners to tackle ~25% of the 50-mile relay. This plan will recommend 3-4 days of running per week and will build from long runs of 5-6 miles to long runs of 12-14 miles.

50-Mile Relay 2-3 Member Team Plan - 12 Weeks: This training plan is intended to prepare runners to tackle ~50% of the 50-mile relay. This plan will recommend 4-5 days of running per week and will build from long runs of 10-12 miles to long runs of 20-22 miles.

 

Pre-Training Block (8 Weeks):

Worried about building up safely for the long runs at the beginning of your training plan? This 8-week training block is focused on a progression of long runs that will ensure you can seamlessly transition to the full 20-week plan when it begins. Pre-training blocks also include basic core routines and suggested daily/weekly mileage to prepare for the full training plan. Blocks are available to prepare for the 50k and 50-mile plans.

 

2024 Participant Feedback:

"I would love to shout out the training plans the coaches, Caleb Masland, provided! As a first time 50 miler the training plan was fantastic. I have never used a coach and I would 100% pay for this again! I felt well trained and I recovered so well between the easy and hard efforts. I followed the plan from day one to race day and never missed a workout! I questioned some days after back to back long run or speed work/hills whether I could do the next days workout but somehow I was ready to go by the next day. Pure Magic! Loved it! I felt confident and totally prepared to run 50 miles. This is something I would make sure to offer again as it was so beneficial to me completing my first 50 miler! Thank you again!" - Carrie W., 2024 Thumb Coast Ultra participant

 

Questions?  If you have any questions about training plans, email Coach Caleb at caleb@ironrootdistance.com.

Vendor and Sponsor Opportunities

Interested in joining as a race day vendor or sponsor? Email us at cathi@triviumracing.com for more details. 

To complete your virtual race and receive your finisher medal and jacket, follow these steps:

1. Run your 50K or 50 Mile event at a place and time of your choosing.
2. Track your time with a watch or fitness app.
3. Report your time on our results page by clicking "Submit Virtual Results". Results can be submitted anytime between March 1, 2025 and April 25, 2025. Don't forget to share your virtual race selfies too! If you have trouble, here's a step-by-step guide!

Once all results are submitted, shirts and finisher medals will be mailed out within 10 days after race day. Please double check that your mailing address is correct on your registration before race day! 

Virtual participants are not eligible for awards. An extra charge will be applied for international shipping. Contact us if you need a quote for international shipping.

Any changes to virtual on or after race day will be subject a shipping charge.

We'll continue to update 2026 weekend specials.

Thursday, April 23

In town early?  Stop by Thumb Brewery from 11:30-8:00 for lunch or dinner.  Keep your eye on social media for their third annual Thumb Coast Ultra & Relay special tribute beer brew release!

Friday, April 24

Visit Thumb Brewery on Friday, April 24 from 2:00-7:00 for packet pickup!  Thumb Brewery is offering 15% off to all 2026 participants and volunteers during race weekend.  Stop in to carb load before the race and again to celebrate after crossing that finish line!  Open Friday 11:30-8:00.  They'll be hosting running-themed Music Bingo!

Saturday, April 25

The Thumb Brewery kitchen will be open 11:30 am-8:00 pm.  Don't forget, participants and volunteers get 15% off!  They'll have live music and a DJ from noon into the early evening as you eat, drink, and celebrate your amazing accomplishment.  They'll have an outdoor heated tent, weather permitting.

Sunday, April 26

Thumb Brewery will be open from 11:30-2:30 for lunch before you head out of town.

 

Thumb Coast Ultra & Relay Registration Includes:

Custom Thumb Coast Ultra Jacket

Finisher's Medal

Thumb Coast Ultra Bumper Sticker

Reusable Race Cup

Race Photography

Post race food and drinks (In addition to traditional post race snacks, 2025 featured a cook to order breakfast. 2024 featured pizza.)

 

 

You can change your jacket size by following these instructions.

• Login to RunSignup through your race registration confirmation email.
• Profile
• Upcoming Events (Thumb Coast Ultra)
• Manage Registration
• Giveaway

 

2026 Finisher Medal

Finishers at Thumb Coast Ultra will earn a substantial, 4” tall, 5mm thick brass medal with an antique finish, featuring real sand embedded in the design. The lighthouse is inspired by the Harbor Beach Lighthouse, marking the sunrise start for the 50 Mile and Relay, while the sun charm honors 50 Milers who finish before sunset and beat the sun. Built to reflect the grit, effort, and meaning behind every mile.

Thumb Coast Ultra 50 Mile: Jacket

Thumb Coast Ultra 50 Kilometer: Jacket

50 Mile Relay: Jacket

50 Mile Ruck: Jacket

50K Ruck: T-Shirt

Virtual 50 Mile: Jacket

Virtual 50K: Jacket