Ultra Races in Colorado

Freedom Tour Classic

Sat, Jun 20 · Fort Collins, CO Fort Collins

5K Walk15 Mile25 Mile w/T-shirt +3

From $25 Open Closing Soon

Register →

BRR All-Comers Summer Track & Field Series #2

Thu, Jun 25 · Boulder, CO Boulder

Road Steeplechase (3000 + 2000)100m200m +11

From $20 Open Closing Soon 15 spots left

Register →

Pearl Street Mile

Sat, Jun 27 · Boulder, CO Boulder

Road Pearl Street MileKids 800m

From $15 Open Closing Soon

Register →

Let Freedom Run 5k - LONGMONT

Sat, Jul 4 · Longmont, CO Longmont

Road 5k Run/Walk

From $30 Open

Register →

Let Freedom Run 5k/10k - Louisville

Sat, Jul 4 · Louisville, CO Louisville

Road 5k10k

From $30 Open

Register →

Red, White, and WARRIOR 5K

Sat, Jul 4 · Grand Junction, CO Grand Junction

Road Red, White, and WARRIOR 5KLittle Sparkler Sprint

From $10 Open

Register →

BRR All-Comers Summer Track & Field Series #3

Thu, Jul 9 · Boulder, CO Boulder

Road 5000m100M200M +10

From $20 Open 15 spots left

Register →

Silverheels Trail Runs

Fri, Jul 10 · Como, CO Como

Trail 10-Mile19-Mile60k +3

From $50 Open

Register →

Heatwave Half Marathon - Denver

Sat, Jul 11 · Littleton, CO Littleton

Virtual 1 Mile5K10K +5

From $17 Open Closing Soon 5 spots left

Register →

The Triple Bypass

Sat, Jul 11 · Evergreen, CO Evergreen

Double BypassTriple Bypass

From $245 Open

Register →

Heatwave Half Marathon - Colorado Springs

Sun, Jul 12 · Colorado Springs, CO Colorado Springs

Virtual 1 Mile5 K10 K +5

From $17 Open Closing Soon 5 spots left

Register →

High Lonesome 100

Fri, Jul 17 · Nathrop, CO Nathrop

Ultra 100 Miler

From $465 Open

Register →

TransRockies Run Charity Bibs

Sat, Jul 18 · Buena Vista, CO Buena Vista

Trail Individual Fundraiser Charity Bib

From $0 Open Closing Soon 3 spots left

Register →

BRR All-Comers Summer Track & Field Series #4

Thu, Jul 23 · Boulder, CO Boulder

Road 100M200M400M +10

From $20 Open 15 spots left

Register →

Never Summer 100km & 60km

Fri, Jul 24 · Walden, CO Walden

Ultra Never Summer 60kmThe Double (60km & 100km)Never Summer 100km

From $175 Open 20 spots left

Register →

Audi Snowmass 50 Mountain Bike Race

Sat, Jul 25 · Snowmass Village, CO Snowmass Village

25 Mile Solo Racer (1 Lap)50 Mile Solo Racer (2 laps)50 Mile Team of 2 (2 laps)

From $115 Open 60 spots left

Register →

Spirit of the West 5K Run/Walk

Sun, Jul 26 · Golden, CO Golden

Road 5K Run/Walk

From $35 Open

Register →

Wild West Relay

Fri, Jul 31 · Fort Collins, CO Fort Collins

Wild West Relay - Get Your Ass Over the Pass - Super Ultra team (1-3 runners)Wild West Relay - Get Your Ass Over the Pass - Ultra team (4-6 runners)Wild West Relay - Get Your Ass Over the Pass - High School Team +1

From $660 Open

Register →

Sheep Mountain Trail Runs

Sat, Aug 1 · Fairplay, CO Fairplay

Trail Half Marathon50k50-Mile

From $70 Open

Register →

BRR All-Comers Summer Track & Field Series #5

Thu, Aug 6 · Boulder, CO Boulder

Road 100M200M400M +9

From $20 Open 15 spots left

Register →

Summer Sizzler- Denver

Sat, Aug 8 · Thornton, CO Thornton

Virtual 1 Mile5k10k +4

From $17 Open 5 spots left

Register →

The Berkeley Circuit

Sun, Aug 9 · Denver, CO Denver

Road The Berkeley Circuit

From $30 Open

Register →

Summer Sizzler- Colorado Springs

Sun, Aug 9 · Colorado Springs, CO Colorado Springs

Virtual 1 Mile5K10K +4

From $17 Open 5 spots left

Register →

2026 CKF Leadville Trail 100 MTB

Sat, Aug 15 · Leadville, CO Leadville

2026 CKF Leadville Trail 100 MTB - Extended No House2026 CKF Leadville Trail 100 MTB - Extended With House

From $0 Open

Register →

Golden Harvest Half Marathon & 5k/10k - Denver

Sat, Sep 5 · Westminster, CO Westminster

Virtual 1 Mile5K10K +4

From $17 Open 5 spots left

Register →

Golden Harvest Half Marathon & 5k/10k - Colorado Springs

Sun, Sep 6 · Colorado Springs, CO Colorado Springs

Virtual 1 Mile5K10K +4

From $17 Open 5 spots left

Register →

Flaming Foliage Relay - Idaho Springs to Buena Vista

Fri, Sep 11 · Idaho Springs, CO Idaho Springs

Flaming Foliage Relay - Ultra Team (4-5 Runners)Flaming Foliage Relay - Super Ultra (1-3 runners)Flaming Foliage Relay - 10 person Team (6-10 runners)

From $623 Open

Register →

2026 Lake Nighthorse Triathlon - Sprint and Olympic

Sat, Sep 12 · Durango, CO Durango

Triathlon Sprint Relay - FemaleIndividual SprintSprint Relay - Male +2

From $85 Open

Register →

The Denver 5k

Sat, Sep 12 · Denver, CO Denver

Road 5kFREE Kids Fun Run

From $0 Open

Register →

Rampart Rager Gravel

Sat, Sep 12 · Colorado Springs, CO Colorado Springs

50k70k100k

From $59 Open

Register →

The Gunni Grinder

Sat, Sep 12 · Gunnison, CO Gunnison

The Gunni 30The Gunni 60 (ish)The Gunni Grinder

From $60 Open

Register →

Buffalo Bicycle Classic

Sun, Sep 13 · Boulder, CO Boulder

Little Buff - 10 Mile Ride ($200 Group Pricing for 2-6 riders)35 Mile Mary's LoopGravel Buff 42.3 Miles +6

From $125 Open

Register →

Salida Bike Fest - Salida 76 and the Banana Belt

Sat, Sep 19 · Salida, CO Salida

Banana Belt - 35 MilesLite - 76KMBanquet - 76 Miles +2

From $125 Open

Register →

Red Feather Trail Jamboree

Fri, Sep 25 · Red Feather Lakes, CO Red Feather Lakes

Trail Red Feather Trail Jamboree Half MarathonRed Feather Trail Jamboree 50kmRed Feather Trail Jamboree 50 Mile +1

From $90 Open

Register →

Mountains to the Desert Classic

Sat, Sep 26 · Telluride, CO Telluride

Norwood to GatewayTelluride to GatewayRidgway to Gateway

From $185 Open

Register →

Sangre de Cristo Trail Festival

Sat, Sep 26 · Westcliffe, CO Westcliffe

Trail 8-Mile27k50k +3

From $40 Open

Register →

Estes Epic

Sat, Sep 26 · Estes Park, CO Estes Park

Trail Heavy Half Marathon50k Run50k Bike +1

From $80 Open Closing Soon

Register →

West Line Winder

Sat, Sep 26 · Buena Vista, CO Buena Vista

Trail 50k30k

From $105 Open

Register →

Sawatch Ascent

Sun, Sep 27 · Nathrop, CO Nathrop

Ultra 50k

From $129 Open

Register →

Spooky Sprint - Denver

Sat, Oct 3 · Littleton, CO Littleton

Virtual 1 Mile5K10K +4

From $20 Open Closing Soon 5 spots left

Register →

Indian Creek Trail Runs

Sat, Oct 17 · Sedalia, CO Sedalia

Trail 5-Mile15-Mile55k +1

From $30 Open

Register →

I Ain't Scared (of 5k)

Sat, Oct 31 · Thornton, CO Thornton

Road 5k

From $29 Open

Register →

Turkey Trails- Denver

Sat, Nov 7 · Littleton, CO Littleton

Virtual 1 Mile5K10K +4

From $17 Open 5 spots left

Register →

Turkey Trails - Colorado Springs

Sun, Nov 8 · Colorado Springs, CO Colorado Springs

Virtual 1 Mile5k10k +4

From $17 Open 5 spots left

Register →

The Pilgrimage Run 2026

Thu, Nov 26 · Erie, CO Erie

Road 2 Mile Run / Walk4 Mile Run4 Mile Run (Chip Timed) +1

From $25 Open

Register →

Candy Cane Course - Colorado Springs

Sat, Dec 5 · Colorado Springs, CO Colorado Springs

Virtual 1 Mile5K10K +4

From $22 Open 5 spots left

Register →

Candy Cane Course - Denver

Sun, Dec 6 · Westminster, CO Westminster

Virtual 1 Mile5k10k +4

From $22 Open 5 spots left

Register →

NoCo Urban Ultra & Relay

Sun, Apr 11 · Bellvue, CO Bellvue

Ultra 50 Mile (Relay)50 Mile (Individual)50 Mile (Individual) +5

From $65 Open

Register →

Unicorn 5k (Denver-East)

Sun, Apr 25 · Denver, CO Denver

Road 5k5k1/2 Mile(ish) Saunter +1

From $13 Open

Register →

Greenland Trail Races

Sat, May 1 · Larkspur, CO Larkspur

Ultra 4 Mile4M Trail Races8 Mile +9

From $25 Open

Register →