Running Races in Colorado — 2026

There are 290 running races in Colorado in 2026 across 80 cities. The next upcoming race is the Flying Falcon Downhill Mile in USAF Academy on October 10. Popular distances include 5K races, half marathons, ultras.

The Steamboat Marathon

Sun, Jun 6 · Steamboat Springs, CO Steamboat Springs

Road 10K10KHalf Marathon +3

From $65 Open

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Flamingo Day 5K

Sun, Jun 6 · Denver, CO Denver

Road 5KVirtual 5KVirtual 5K +1

From $30 Open

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All-Out Summer Breeze

Sat, Jun 12 · Arvada, CO Arvada

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

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Run Juneteenth Day 5K/10K/13.1 DENVER/AURORA

Sat, Jun 19 · Centennial, CO Centennial

Virtual Family Fun Run 1 MileVirtual Run Registration (5K/10K/13.1)5K Registration +3

From $30 Open

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Father's Day Classic 10k, 5k, & 1 Mile

Sun, Jun 20 · Arvada, CO Arvada

Road 1 Mile Fun Run (untimed)Manly Mile (TIMED - for MEN Only)1 Mile Fun Run (untimed) +9

From $8 Open

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South Fork Pandemonium

Fri, Jun 25 · South Fork, CO South Fork

Pandemonium-Family StylePandemonium-Family StylePandemonium-Main Event +1

From $20 Open 72 spots left

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Race in the Clouds - Alma Dirt Festival 2027

Fri, Jun 25 · Alma, CO Alma

Trail Highschool/Middle School Short Course (6.1miles)Highschool/Middle School Short Course (6.1miles)Trail 10K +21

From $0 Open 10 spots left

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Cookie Chase

Sat, Jul 10 · Denver, CO Denver

Road Virtual 5KVirtual 5K5K +1

From $30 Open

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All-Out Dog Days

Sat, Jul 10 · Westminster, CO Westminster

Virtual VIRTUAL 5KVIRTUAL 5K5K +9

From $20 Open

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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 - Denver

Sat, Jul 17 · Denver, CO Denver

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 - Get Your Ass Over the Pass - 12 person team (7-12 runners)Wild West Relay - Get Your Ass Over the Pass - High School TeamWild West Relay - Get Your Ass Over the Pass - Ultra team (4-6 runners) +5

From $660 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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All-Out Runapalooza

Sat, Aug 7 · Arvada, CO Arvada

Virtual 5K5KVIRTUAL 5K +9

From $20 Open

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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 2027 Suicide Prevention Color Walk/Run2026 Suicide Prevention Color Walk/Run Virtual2026 Suicide Prevention Color Walk/Run +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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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 VIRTUAL 5KVIRTUAL 5K5K +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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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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