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.
See also: 2018 Calendar of Colorado Half Marathons
Arvada
9/11 Remembrance Run Half Marathon, 10K & 5K
All-Out Polar Prowl Half Marathon, 10K & 5K
All-Out Summer Breeze Half Marathon, 10K & 5K
Aspen
Aspen Valley Marathon, Half Marathon & 5K
Basalt
Buena Vista
Autumn Color Run Half Marathon, 10K & 5K
Boulder
Boulder Backroads Marathon, Half Marathon & 10K
Boulder Spring Half Marathon, 10-Mile & 10K
Breckenridge
Breck Crest Mountain Marathon & Half Marathon
Breckenridge Hunky Dory Half Marathon
Breckenridge Road Marathon, Half Marathon & 10K
Castle Rock
Area 13.1 Half Marathon & Terrestrial 5K
Castle Rock Half Marathon, 5-Mile & Rock Challenge
Colorado National Monument
Rim Rock Marathon & Half Marathon
Colorado Springs
American Discovery Trail Marathon & Half Marathon
Big Mountain Trail Run Half Marathon, 10K & 5K
Colorado Springs Marathon, Half Marathon & 5K
Super Half Marathon & 5K Family Run/Walk
Xterra Trail Run Marathon, Half Marathon & 5K
ZOOMA Colorado Half Marathon & 10K
Copper Mountain
Creede
Runoff Runoff Marathon, Half Marathon & 6K
Crested Butte
Crested Butte Fall Color Classic Half Marathon
Denver
Colfax Marathon, Half Marathon, Relay & Urban 10-Miler
Race for Open Space Half Marathon, 5K & 10K
Rock & Roll Denver Marathon & Half Marathon
Durango
Steamworks Animas Valley Half Marathon
Empire
Devil on the Divide Half Marathon & 50K
Erie
Redline 13.1 Erie Half Marathon & 5K
Estes Park
Estes Park Marathon & Half Marathon, 10K & 5K
Evergreen
Revel Rockies Marathon & Half Marathon
Fort Collins
Blue Sky Marathon & Half Marathon
Colorado Marathon, Half Marathon, 5K & 10K
Equinox Half Marathon & 5-Mile Run
Red Mountain Trail Race Half Marathon
Frisco
Gateway
4th of July Half Marathon & 5K
The Better 1/2 Half Marathon & 5-Mile Run
Georgetown
Georgetown to Idaho Springs Half Marathon
Glenwood Springs
Glenwood Canyon Shuffle Race for Literacy
Glenwood Springs Half Marathon & 10K
Mountain to Valley Half Marathon, 4-Mile & 1/2-Mile
Golden
Grand Junction
Highlands Ranch
Highlands Ranch Half Marathon & 5K
Wildcat Mountain Half Marathon
Keystone
Keystone Half Marathon, 10K, 5K & Kids Run
Lake City
Mountaineer Marathon & Half Marathon
Lakewood
The Bear Chase Trail Half Marathon, 50K, 10K & 50-Miler
Mount Carbon Trail Half Marathon & North Park Trail 5K
Leadville
Littleton
Denver Trail Half Marathon & 10K
Fear the Deer Trail Half Marathon
Platte River Half Marathon & Buckhorn Exchange Relay
Longmont
American Heroes Run Marathon, Half Marathon, Relay, Ultra & 5K
Louisville
Taste of Louisville Half Marathon, 5K & Kids Run
Loveland
Heart Center of the Rockies Half Marathon, 10K & 5K
Mancos
Mancos Cowboy Half Marathon, 5K & Fun Run
Manitou Springs
Pikes Peak Ascent Half Marathon
Pagosa Springs
Devil Mountain Ultra 50-Mile, 50K & Half Marathon
Mountain Chile Cha Cha 5K, 10K & Half Marathon
Turkey Track Trail Marathon & Half Marathon
Palisade
Grand Valley Marathon, Half Marathon, 10K & 5K
Pueblo
Ridgway
Salida
Arkansas River Bluegrass Marathon & Half Marathon
Run Through Time Marathon, Half Marathon & 2-Mile Run
Silverton
Kendall Mountain Run Marathon & Half Marathon
Steamboat Springs
Mountain Madness Half Marathon
Steamboat Marathon, Half Marathon & 10K Run/Walk
Trinidad
Bulldog Run Half Marathon, 10K & 5K
Run for the Fallen Coal Miners Half Marathon, 10K & 5K
Vail
La Sportiva Vail Half Marathon
Teva Mountain Games Vail Pass Half Marathon
Westminster
All-Out Fa La La Half Marathon, 10K & 5K
Dog Days Half Marathon, 10K & 5K
Redline 13.1 Westminster Half Marathon & 5K Run/Walk
Winter Park
Winter Park Half Marathon & 5K
