Running Races in Colorado — 2026

There are 349 running races in Colorado in 2026 across 96 cities. The next upcoming race is the One Is Too Many: Veteran Suicide Awareness 5k and Kids Run in Greeley on July 19. Popular distances include 5K races, half marathons, trail runs.

Horsetooth Half Marathon - Presented by Fort Collins Connexion

Sun, Apr 18 · Fort Collins, CO Fort Collins

Road Half MarathonHalf Marathon

From $75 Open Closing Soon

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Bigfoot Half Marathon

Sat, Apr 24 · Estes Park, CO Estes Park

Road 5K Run/Walk5K Run/WalkHalf Marathon +1

From $45 Open

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All-Out Beat the Heat

Sat, Apr 24 · Westminster, CO Westminster

Virtual VIRTUAL 5K5KVIRTUAL 5K +9

From $20 Open

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Unicorn 5k (Denver-East)

Sun, Apr 25 · Denver, CO Denver

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

From $13 Open

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Greenland Trail Races

Sat, May 1 · Larkspur, CO Larkspur

Ultra 4M Trail Races4 Mile8 Mile +9

From $25 Open

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Colterris Wine Run 5k

Sat, May 8 · Palisade, CO Palisade

Road 5k5k

From $30 Open

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Flamingo Day 5K

Sun, Jun 6 · Denver, CO Denver

Road Virtual 5K5K5K +1

From $30 Open

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All-Out Summer Breeze

Sat, Jun 12 · Arvada, CO Arvada

Virtual VIRTUAL 5K5KVIRTUAL 5K +9

From $20 Open

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Unicorn 5k (North)

Sat, Jun 19 · Thornton, CO Thornton

Road 1/2 (ish) Mile Saunter - untimed1/2 (ish) Mile Saunter - untimed5k Run/Walk +1

From $16 Open Closing Soon

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Race in the Clouds - Alma Dirt Festival 2027

Thu, Jun 24 · Alma, CO Alma

Trail Highschool/Middle School Short Course (6.1miles)Highschool/Middle School Short Course (6.1miles)Trail 10K +19

From $0 Open 10 spots left

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Red, White, and WARRIOR 5K

Sat, Jul 3 · Grand Junction, CO Grand Junction

Road Red, White, and WARRIOR 5KRed, White, and WARRIOR 5KLittle Sparkler Sprint +1

From $10 Open

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50 States Half Marathon Club General Membership

Fri, Feb 10 · Colorado Springs, CO Colorado Springs

Road 50 States Half Marathon Club General Membership

From $85 Open

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Fifty States Half Marathon Club Life Membership

Sat, Feb 11 · Colorado Springs, CO Colorado Springs

Road Fifty States Half Marathon Club Life Membership

From $429 Open

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