Half Marathons in Colorado

Race in the Clouds - Alma Dirt Festival 2027 · Alma, Colorado

Slacker Half Marathon-Relay-4-Mile Races · Georgetown, Colorado

The Sunlight Showdown · Glenwood Springs, Colorado

Operation HAYSTACK · Nederland, Colorado

July 4th ROCK-IT Run · Castle Rock, Colorado

July 4th Run 5K/10K/13.1 DENVER/AURORA · Centennial, Colorado

Run for Chocolate 5K/10K/13.1 DENVER/AURORA · Centennial, Colorado

6th Annual July 4th ROCK-IT RUN · Castle Rock, Colorado

Colorado Brewery Running Series - Wheat Ridge Half Marathon and 5K · Wheat Ridge, Colorado

All-Out Dog Days · Westminster, Colorado

Heatwave Half Marathon - Denver · Littleton, Colorado

Heatwave Half Marathon - Colorado Springs · Colorado Springs, Colorado

Surf and Turf Triathlon · Aurora, Colorado

Summer Splash Prairie Dog Half, 10k, & 5k · Castle Rock, Colorado

2026 TransRockies Run · Buena Vista, Colorado

Barr Trail Mountain Race · Manitou Springs, Colorado

Aspen Valley Marathon · Aspen, Colorado

Run for Coffee Lovers 5K/10K/13.1 DENVER/AURORA · Centennial, Colorado

Sheep Mountain Trail Runs · Fairplay, Colorado

Rocky Mountain Half Marathon · Estes Park, Colorado

Popsicle 5K/10K/Half Marathon -Colorado Springs · Colorado Springs, Colorado

Bound for Boston Marathon & Half Marathon - Denver · Denver, Colorado

Choice City Running Festival · Fort Collins, Colorado

Georgetown to Idaho Springs Half Marathon · Unknown, Colorado

Run the Rockies Trail Race · Frisco, Colorado

2026 Runapalooza · Arvada, Colorado

All-Out Runapalooza · Arvada, Colorado

Georgetown to Idaho Springs Half Marathon · , Colorado

Emerald Mountain Epic · Steamboat Springs, Colorado

Boulder Rez Marathon · Boulder, Colorado

Mt. Sneffels Half Marathon & 10K · Ouray, Colorado

Westminster Trail Race · Westminster, Colorado

The Cheyenne Mountain Run · Colorado Springs, Colorado

Run for PB& J 5K/10K/13.1 DENVER/AURORA · Centennial, Colorado

Erie Half & 5k · Erie, Colorado

Byers Peak Stampede Half Marathon & 5K Run · Fraser, Colorado

Staunton Rocks! Marathon and Half Marathon · Pine, Colorado

Arrowhead Half Marathon & 5K · Vail, Colorado

Bergen Peak Half Marathon Trail Race - 8/22/26 · Evergreen, Colorado

Pioneer Prairie Dog Half, 10k & 5k · Westminster, Colorado

TBK Bank Thirsty 13 Half Marathon · Durango, Colorado

Sloth Run 5K/10K/13.1 DENVER/AURORA · Centennial, Colorado

Golden Harvest Half Marathon & 5k/10k - Denver · Westminster, Colorado

Golden Harvest Half Marathon & 5k/10k - Colorado Springs · Colorado Springs, Colorado

Wheat Ridge Half Marathon and 5K · Wheat Ridge, Colorado

Labor Day Half Marathon · Parker, Colorado

Black Squirrel Half Marathon · Bellvue, Colorado

Snow Mountain Ranch Trail Festival · Granby, Colorado

Ned Ned Run · Nederland, Colorado

Trail Sisters Women's Half Marathon & 10k · Buena Vista, Colorado