Half Marathons in Colorado
From first-timer-friendly flats to trails worth traveling for, find a Colorado half marathon that fits your goals and your sense of adventure.
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upcoming races
138 races
Bigfoot Half Marathon · Estes Park, Colorado
Runs With Scissors Races · Brighton, Colorado
NOCO Half Marathon & 10K · Loveland, Colorado
Blue Heron Half & 5K · Brighton, Colorado
Cinco De Mayo Run 5K/10K/13.1 DENVER/AURORA · Centennial, Colorado
Sunrise Marathon 5K/10K/13.1 DENVER/AURORA · Centennial, Colorado
Longmont Half & 5k (LM Half) · Longmont, Colorado
The Colorado Marathon · Fort Collins, Colorado
Hometown Half Marathon & 5k/10k - Colorado Springs · Colorado Springs, Colorado
Carbon Valley Half Marathon · Firestone, Colorado
Valkyrie Trail Race · Colorado Springs, Colorado
Mothers Day Run Colorado - Louisville · Boulder, Colorado
Super Mom 5K/10K/Half - Colorado Springs · Colorado Springs, Colorado
Hometown Half Marathon & 5k/10k - Denver · Denver, Colorado
Fruita Trail Half · Fruita, Colorado
Endure Trail Runs · Divide, Colorado
Vallecito Lake Heavy Half · Bayfield, Colorado
Girls on the Run Rockies Colfax SoleMates 2026 · Denver, Colorado
Wild Horse Half · De Beque, Colorado
Denver Colfax Marathon · Denver, Colorado
Farish Trail Race · Woodland Park, Colorado
Memorial Day Run 5K/10K/13.1 DENVER/AURORA · Centennial, Colorado
Weld Your Mettle Running Festival · Eaton, Colorado
Evergreen Trail Race Series 2026 (Ext Distance Package of 4) · Evergreen, Colorado
Evergreen Trail Race Series 2026 (5k ONLY Package of 4) · Evergreen, Colorado
Steamworks Half Marathon · Durango, Colorado
Summits Trail Runs · Granby, Colorado
The Valley Bottom Rio Trio · Alamosa, Colorado
2.2 for 22q Walk/Run/Ride 2026 · Anywhere, Colorado
SuperHeroes Run 5K/10K/13.1 DENVER/AURORA · Centennial, Colorado
2026 Basalt Half Marathon & Relay · Basalt, Colorado
Colorado 13er (Half Marathon/10k/5k) · Louisville, Colorado
The Steamboat Marathon · Steamboat Springs, Colorado
Colorado Brewery Running Series - Breckenridge Half Marathon and 5K · Littleton, Colorado
All-Out Summer Breeze · Arvada, Colorado
Barr Lake 30K and 15K · Brighton, Colorado
Run Juneteenth Day 5K/10K/13.1 DENVER/AURORA · Centennial, Colorado
Estes Park Marathon · Estes Park, Colorado
Race in the Clouds - Alma Dirt Festival 2026 · Alma, Colorado
Slacker Half Marathon-Relay-4-Mile Races · Georgetown, Colorado
The Sunlight Showdown · Glenwood Springs, Colorado
Operation HAYSTACK · Nederland, Colorado
July 4th Run 5K/10K/13.1 DENVER/AURORA · Centennial, Colorado
Run for Chocolate 5K/10K/13.1 DENVER/AURORA · Centennial, Colorado
Colorado Brewery Running Series - Wheat Ridge Half Marathon and 5K · Wheat Ridge, Colorado
All-Out Dog Days · Westminster, Colorado
Heatwave Half Marathon - Denver · Denver, Colorado
Heatwave Half Marathon - Colorado Springs · Colorado Springs, Colorado
Summer Splash Prairie Dog Half, 10k, & 5k · Castle Rock, Colorado
Barr Trail Mountain Race · Manitou Springs, Colorado
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