15th Annual Rock CF Rivers Half Marathon & 5K

THE ROCK CF RIVERS HALF MARATHON IS BACK!

Join us as we Outrun Cystic Fibrosis!
 
Sunday, March 22, 2026

Rock CF is hitting the island for the 15th Annual Rivers Half Marathon, 5K Run/Walk & NEW 15K! 

Rock CF is a community, thousands strong, changing the face of what living with cystic fibrosis looks like and giving those living with CF the tools to not only survive, but thrive. 100% of all proceeds support the mission of the Rock CF Foundation.

Caps for 2026
Half Marathon Cap = 800

15K Cap = 300

5K Run/Walk Cap = 500

HALF MARATHON 

Start Time: 8:00am

Start Location: Grosse Ile Middle School - 23270 E River Rd, Grosse Ile Township, MI 48138

Finish Location Grosse Ile Middle School - 23270 E River Rd, Grosse Ile Township, MI 48138

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15K 

Start Time: 8:00am

Start Location: Grosse Ile Middle School 

Finish Location: Grosse Ile Airport Area

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5K RUN/WALK

Start Time: 8:15 am

Start Location:  Grosse Ile Airport (South of Naval Hangar)

Finish Location: Grosse Ile Middle School

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VIRTUAL RUN

We will be sending out packets the week of the race so that you can participate with us from wherever you are! Whether that be a walk around the block or a full half marathon, we can't wait to see what you accomplish. Be sure to tag us on our socials @LetsRockCF so we can share your journey and runs!

 2026 Rock CF Rivers Half Marathon, 15K & 5K Parking Info

There is NO race parking at Grosse Ile Middle School or Grosse Ile High School on race day!

1) Township Shuttle Lots by Grosse Ile Airport: Beginning at 6am to GI Middle School

- Use the address 9801 Intrepid & enter off of Meridian Rd. only
- Please park where volunteers advise 
- Half & 15K runners must board a bus to the Middle School for start & packet pickup
- Bus loading is on Saratoga Ave
- Buses will run continuously until race time & resume post race
- 5K runners do not board the shuttles. Your start & packet pickup is walkable, across Groh Rd
- Post Race: buses will drive Half Marathon & 5K runners back to these lots from the Middle School 
- 15K runners finish at the airport. This is across the street from these shuttle lots

We strongly encourage Half Marathon & 15K runners to arrive to the shuttle lots early, especially if you need to pick up your packet. Our suggestion is 90 minutes to allow time to park, and wait for bus loading. Shuttle time from the lots to the Middle School is 8-10 minutes but it will take longer with race traffic.

2) Grosse Ile Golf & Country Club *New this year!*: Beginning at 6am to Middle School Only

- This lot will fill up early!
- Pre race shuttles will only run to the Middle School from the Country Club
- 5K runners that park here will need to ride the shuttle to the Middle School, then board a bus to the 5K area at the airport
- Post Race: Buses will drive runners from both finish areas back to the lot

3) Macomb Street (Select businesses with Race Parking Sign out front)

- Roughly 0.5 to 0.75 mile walk to the Middle School via the path behind the High School
- Please only park in lots that have a Race Parking sign out front
- Fifth Third Bank, Building Blocks, Nate’s, Public Service Credit Union, Tails, Ralph’s Lawn, Island Goods (old lot), & lot at 7738 Macomb Parking Lot
- These lots are on Macomb between Parke Lane & E. River

Note: The 15K Finish Line is at the airport. Runners that need to be shuttled to the Middle School or the Country Club can catch a shuttle here.

Below is a detailed map of the airport area & shuttle parking!

All participants will receive a race medal with their respective distance (including virtual!) as well as a race shirt. Here are some shots of this year's Rock CF Rivers Half Marathon race shirt and medal! 🤘 

Don't miss out on your chance to join us for a lap around beautiful Grosse Ile on the Detroit River! We are expecting the race to sell out for the 4th consecutive year. Register today: https://runsignup.com/Race/Register/?raceId=169581

Schedule of Events for Rock CF Rivers Half Marathon Race Week!

Packet Pick Up

Wednesday, March 18 & Thursday, March 19- RUNdetroit (1948 Division Ste. 105, Detroit, MI 48207)
10:00 am - 6:30 pm 

Saturday, March 21- Grosse Ile MIDDLE School Gym  (23270 E. River Rd
Expo/Packet Pick Up for All Distances: 12:00 pm - 6:00 pm

Race Day - Sunday, March 22 

IMPORTANT REMINDER! There is no parking available at Grosse Ile Middle School or Grosse Ile High School. Please utilize the information found on our parking info page found here for the Airport Township Shuttle Lots: https://runsignup.com/Race/rockcfrivers/Page-4

Half Marathon & 15K

Start/Finish/Pick Up is located in Grosse Ile MIDDLE School gym

6:00 am - 7:50 am | Half Marathon & 15K Packet Pick Up

6:00 am | VIP Area Opens

6:00 am | Shuttles start between shuttle parking lots & middle school

8:00 am | Half Marathon & 15K Start

11:30 am | Finish Line closes

11:45am | Last Shuttles to shuttle parking lots

15K Finishes at the Grosse Ile Airport

5K Run/Walk

Start Line is located inside of Grosse Ile Airport Naval Air Hangar

Packet Pick Up is located at Grosse Ile Pilot House - 9645 Groh Rd. Grosse Ile, MI

6:00 am – 8:00 am | Packet Pick Up/Registration at Grosse Ile Pilot House

8:15 am | 5K Start

5K Finishes at Grosse Ile Middle School