Running Races in Colorado — 2026

There are 269 running races in Colorado in 2026 across 73 cities. The next upcoming race is the DU Crimson Classic 5K Run/1.5 Mile Walk in Denver on October 21. Popular distances include 5K races, half marathons, ultras.

Heatwave Half Marathon/5K/10K - Denver

Sat, Jul 17 · Denver, CO Denver

Virtual 1 Mile1 Mile5K +12

From $17 Open 5 spots left

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Summer Splash Prairie Dog Half, 10k, & 5k

Sat, Jul 17 · Castle Rock, CO Castle Rock

Road 5k5k10k +3

From $25 Open

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Heatwave Half Marathon/5K/10K - Colorado Springs

Sun, Jul 18 · Colorado Springs, CO Colorado Springs

Virtual 1 Mile1 Mile5K +12

From $17 Open 5 spots left

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Spirit of the West 5K Run/Walk

Sun, Jul 25 · Golden, CO Golden

Road 5K Run/Walk5K Run/Walk

From $35 Open

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Eldorado Run for the Cure

Thu, Aug 5 · Eldorado Springs, CO Eldorado Springs

Road Eldorado Run for the CureEldorado Run for the Cure

From $30 Open

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Wild West Relay

Fri, Aug 6 · Fort Collins, CO Fort Collins

Wild West Relay - High School TeamWild West Relay - Ultra team (4-6 runners)Wild West Relay - Get Your Ass Over the Pass - Ultra team (4-6 runners) +5

From $660 Open

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All-Out Runapalooza

Sat, Aug 7 · Arvada, CO Arvada

Virtual VIRTUAL 5KVIRTUAL 5K5K +9

From $20 Open

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Unicorn 5k (South)

Sat, Aug 7 · Highlands Ranch, CO Highlands Ranch

Road 5k Run/Walk5k Run/Walk3/4 (ish) Mile Saunter +1

From $13 Open

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Summer Sizzler- Denver

Sat, Aug 7 · Denver, CO Denver

Virtual 1 Mile1 Mile5k +11

From $17 Open 5 spots left

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Summer Sizzler- Colorado Springs

Sun, Aug 8 · Colorado Springs, CO Colorado Springs

Virtual 1 Mile1 Mile5K +11

From $17 Open 5 spots left

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Erie Half & 5k

Sun, Aug 15 · Erie, CO Erie

Road 5k5kHalf Marathon +1

From $30 Open

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Byers Peak Stampede Half Marathon & 5K Run

Sat, Aug 21 · Fraser, CO Fraser

Road 5K5KHalf Marathon +1

From $45 Open

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Pioneer Prairie Dog Half, 10k & 5k

Sun, Aug 22 · Westminster, CO Westminster

Road 5k5k10k +3

From $25 Open

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2027 Suicide Prevention Color Walk/Run

Wed, Sep 1 · Center, CO Center

Virtual 2026 Suicide Prevention Color Walk/Run Virtual2027 Suicide Prevention Color Walk/Run2026 Suicide Prevention Color Walk/Run Virtual +1

From $25 Open

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Labor Day Half Marathon

Mon, Sep 6 · Parker, CO Parker

Road 5K5K10K +5

From $27 Open

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Spirit of the Valley 5k

Tue, Sep 7 · Grand Junction, CO Grand Junction

Virtual 1K Roll1K Run1K Roll +7

From $10 Open

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The Denver 5k

Sat, Sep 11 · Denver, CO Denver

Road 5k5kFREE Kids Fun Run +1

From $0 Open

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

Sat, Sep 11 · Denver, CO Denver

Virtual 1 Mile1 Mile5K +11

From $17 Open 5 spots left

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

Sun, Sep 12 · Colorado Springs, CO Colorado Springs

Virtual 1 Mile1 Mile5K +11

From $17 Open 5 spots left

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All-Out Fall Fest

Sat, Sep 18 · Westminster, CO Westminster

Virtual 5KVIRTUAL 5KVIRTUAL 5K +9

From $20 Open

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Spooky Sprint - Denver

Sat, Oct 2 · Denver, CO Denver

Virtual 1 Mile1 Mile5K +14

From $20 Open 5 spots left

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Manitou 5K

Sat, Oct 9 · Manitou Springs, CO Manitou Springs

Road Manitou 5K 18 and underManitou 5KManitou 5K +1

From $25 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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