Half Marathons in Colorado — 2026

There are 80 half marathons in Colorado scheduled for 2026. The next is the Coffee Lovers Run 5K/10K/13.1 DENVER/AURORA in Centennial on October 10. Colorado half marathons run primarily October through February.

Spring Fling Prairie Dog Half, 10k, & 5k

Sun, Apr 11 · Arvada, CO Arvada

5k5k10k +3

From $25 Open

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Platte River Half-Marathon, Relay & 5k

Sun, Apr 11 · Littleton, CO Littleton

2027 5k5k5k +6

From $35 Open

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Horsetooth Half Marathon - Presented by Fort Collins Connexion

Sun, Apr 18 · Fort Collins, CO Fort Collins

Half MarathonHalf Marathon

From $75 Open

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Coffee Lover Run DENVER/AURORA

Sat, Apr 24 · Centennial, CO Centennial

Family 1 Mile Fun Run5K/10K/13.1 Eco-Registration (No Shirt)5K Registration +3

From $30 Open

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All-Out Beat the Heat

Sat, Apr 24 · Westminster, CO Westminster

VIRTUAL 5KVIRTUAL 5K5K +9

From $20 Open

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Run for Donut DENVER/AURORA

Sat, Apr 24 · Centennial, CO Centennial

Family 1 Mile Fun Run5K/10K/13.1 Eco-Registration (No Shirt)Virtual Run Registration +3

From $30 Open

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Bigfoot Half Marathon

Sat, Apr 24 · Estes Park, CO Estes Park

5K Run/Walk5K Run/WalkHalf Marathon +1

From $45 Open

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Longmont Half & 5k (LM Half)

Sun, May 2 · Longmont, CO Longmont

5k5kHalf Marathon +1

From $35 Open

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Run for Chocolate 5k/10k/13.1 DENVER/AURORA

Sat, May 8 · Centennial, CO Centennial

Family 1 Mile Fun Run5K/10K/13.1 Eco-Registration (No Shirt)5K Registration +3

From $30 Open

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Vallecito Lake Heavy Half

Sat, May 15 · Bayfield, CO Bayfield

Vallecito Lake Heavy Half MarathonVallecito Lake Heavy Half Marathon

From $75 Closed

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SuperHeroes Run DENVER/AURORA

Sat, May 29 · Centennial, CO Centennial

Family 1 Mile Fun RunVirtual Run Registration5K Registration +3

From $30 Open

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Colorado 13er (Half Marathon/10k/5k)

Sun, Jun 6 · Louisville, CO Louisville

5k5k10k +3

From $30 Closed

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All-Out Summer Breeze

Sat, Jun 12 · Arvada, CO Arvada

5KVIRTUAL 5K5K +9

From $20 Open

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Red, White and Brew 5k, 10k & Half Marathon

Sat, Jun 19 · Windsor, CO Windsor

1 Mile Fun Run1 Mile Fun Run5k Ruck +9

From $15 Closed

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

Sat, Jun 19 · Centennial, CO Centennial

Family Fun Run 1 Mile5K/10K/13.1 Eco-Registration (No Shirt)Virtual Run Registration (5K/10K/13.1) +3

From $30 Open

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Slacker Half Marathon-Relay-4-Mile Races

Sat, Jun 26 · Georgetown, CO Georgetown

Virtual 4 Mile4-Mile4-Mile +11

From $35 Closed

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Grin & Bear It

Sat, Jul 10 · Crested Butte, CO Crested Butte

15 km Out and Back15 km Out and BackMountain Bike +3

From $75 Closed 74 spots left

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All-Out Dog Days

Sat, Jul 10 · Westminster, CO Westminster

5K5KVIRTUAL 5K +9

From $20 Open

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

Sat, Jul 17 · Castle Rock, CO Castle Rock

5k5k10k +3

From $25 Open

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Popsicle 5K/10K/Half - Colorado Springs

Sat, Jul 31 · Colorado Springs, CO Colorado Springs

5K-No Shirt5K-No Shirt5K +15

From $25 Closed

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All-Out Runapalooza

Sat, Aug 7 · Arvada, CO Arvada

5KVIRTUAL 5K5K +9

From $20 Open

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Erie Half & 5k

Sun, Aug 15 · Erie, CO Erie

5k5kHalf Marathon +1

From $30 Open

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Byers Peak Stampede Half Marathon & 5K Run

Sat, Aug 21 · Fraser, CO Fraser

5K5KHalf Marathon +1

From $45 Open

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Pioneer Prairie Dog Half, 10k & 5k

Sun, Aug 22 · Westminster, CO Westminster

5k5k10k +3

From $25 Open

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TBK Bank Thirsty 13 Half Marathon

Sat, Aug 28 · Durango, CO Durango

Race Plus BrewfestRace Plus BrewfestJust The Race -- No Brewfest Ticket +1

From $85 Closed

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Labor Day Half Marathon

Mon, Sep 6 · Parker, CO Parker

5K5K10K +5

From $27 Open

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Autumn Run

Sat, Sep 18 · Buena Vista, CO Buena Vista

5K5K10K +3

From $30 Closed 75 spots left

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All-Out Fall Fest

Sat, Sep 18 · Westminster, CO Westminster

VIRTUAL 5K5K5K +9

From $20 Open

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50 States Half Marathon Club General Membership

Fri, Feb 10 · Colorado Springs, CO Colorado Springs

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

Fifty States Half Marathon Club Life Membership

From $429 Open

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