Colorado Half Marathons by City • By Date
Each half marathon that takes place in Colorado is listed below, and when you click the link you’ll find info for each race — what the course is like and a map of the route, the elevation change, whether it’s fast and flat or hilly and challenging, how to sign up, and more.
You’ll also find contact info if you’re having problems with your registration or need to contact the race directors.
2022-2023 calendar of Colorado half marathons
Arvada
All-Out Polar Prowl Half Marathon, 10K & 5K
All-Out Mardi Crawl Half Marathon 10K & 5K
All-Out Summer Breeze Half Marathon, 10K & 5K
All-Out Runapalooza Half Marathon 10K & 5K
Spring Fling Prairie Dog Half Marathon 10K & 5K
Aspen
Aspen Valley Marathon, Half Marathon & 5K
Basalt
Bayfield
Boulder
Boulder Backroads Half Marathon
Boulderthon Marathon & Half Marathon
Boulder Rez Marathon 19.7M Half Marathon 10k & Relay
Brighton
Runs with Scissors Marathon Half Marathon & 50K
Buena Vista
Autumn Color Run Half Marathon, 10K & 5K
Canon City
Rim to Rim Royal Gorge Races Half Marathon
Castle Rock
Castle Rock Trail Festival 50k Half Marathon 10k & 5k
Live Free ROCK-IT Run Half Marathon 5k & 1k
Prairie Dog Half Marathon 10K & 5K
Colorado Springs
Colorado Springs Marathon, Half Marathon & 5K
Super Half Marathon & 5K Family Run/Walk
Valkyrie Trail Race Marathon Half Marathon 50K & 4-Mile
Creede
Runoff Runoff Marathon, Half Marathon & 6K
Crested Butte
Denver
Colfax Marathon, Half Marathon, Relay & Urban 10-Miler
Divide
Mine Shaft Half Marathon & Endure 12-Hour & 24-Hour Challenges
Durango
Southwest Series Marathon Half Marathon 10K & 5K – Day 2
Eagle
Mountain Rats Marathon Half Marathon & 55K
Erie
Estes Park
Estes Park Marathon & Half Marathon
Evergreen
Revel Rockies Marathon & Half Marathon
Fairplay
South Park Trail Marathon Half Marathon & Ultra
Firestone
Carbon Valley Half Marathon & 5K
Fort Collins
Colorado Marathon Half Marathon 10k 5k & Relay
Fall Equinox Marathon Half Marathon & 5M
Long View Marathon & Half Marathon
Revel Rockies Marathon & Half Marathon
Four Corners Monument
Four Corners Quad Keyah Marathon Half Marathon 5k & 2M
Frisco
Run the Rockies Half Marathon & 10K
Run the Rockies Trail Race Half Marathon & 10k
Fruita
Desert RATS Trail Running Festival Half Marathon & 10k
Georgetown
Georgetown to Idaho Springs Half Marathon
Slacker Half Marathon & 4-Mile
Glenwood Springs
Sunlight Showdown Half Marathon
Golden
All-Out Spring Fever Half Marathon 10K & 5K
Black Hawk Trail Half Marathon
Granby
Snow Mountain Ranch Trail Running Festival
Greenwood Village
That Dam Run Half Marathon 10K & 5K
Highlands Ranch
Backcountry Wilderness Half Marathon,
Mountain Ridge Trail Half Marathon
Littleton
Colorado Brewery Running Series – Breckenridge Brewing Half Marathon & 5k
Frosty’s Frozen 5k 10k & Half Marathon
Platte River Half Marathon & Buckhorn Exchange Relay
Longmont
Louisville
Arctic Prairie Dog Half Marathon 10K & 5K
Colorado 13er Half Marathon 10K & 5K
Louisville Trail Race Half Marathon 10K & 5K,
Loveland
Manitou Springs
Pikes Peak Ascent Half Marathon
Ouray
Parker
Pine
Staunton Rocks! Marathon & Half Marathon
Rocky Ford
Arkansas Valley Fair Half Marathon, 10K, 5K & 3K
Salida
Run Through Time Marathon, Half Marathon & 2-Mile Run
Steamboat Springs
Colorado Brewery Running Series – Breckenridge Brewing Half Marathon & 5k
Steamboat Marathon, Half Marathon & 10K Run/Walk
Westminster
All-Out Beat the Heat Marathon Half Marathon 10K & 5K
All-Out Dog Days Half Marathon 10K & 5K
All-Out Fa La La Half Marathon, 10K & 5K
All-Out Fall Fest Marathon Half Marathon 10K & 5K
Pioneer Prairie Dog Half Marathon 10K & 5K
Westminster Trail Half Marathon
