Half Marathons in 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

American Heroes Run · Longmont, Colorado

National Chocolate Day: Run for Chocolates 5K/10K/13.1 DENVER/AURORA · Centennial, Colorado

Buffalo Bicycle Classic · Boulder, Colorado

Nun Run · Denver, Colorado

RMRR Fall Marathon Training Series #2 · Thornton, Colorado

Autumn Run · Buena Vista, Colorado

Pikes Peak Ascent · Manitou Springs, Colorado

Run the Rockies Half Marathon · Frisco, Colorado

All-Out Fall Fest · Westminster, Colorado

Beulah Challenge and OverIt Series · Beulah, Colorado

Fall Equinox · Fort Collins, Colorado

Red Feather Trail Jamboree · Red Feather Lakes, Colorado

Golden Leaf Half Marathon · Aspen, Colorado

Deep Creek Trail Half Marathon · Telluride, Colorado

WILD Wahatoya Runs · La Veta, Colorado

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

Golden Leaf Half Marathon · Aspen, Colorado

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

2026 Boulderthon Half Marathon · Boulder, Colorado

Boulderthon: Downtown Boulder Marathon · Boulder, Colorado

Running for Children's Rights to Both Parents - 9 of 50 Half Marathons in 50 States - Colorado · Boulder, Colorado

Girls on the Run Rockies Boulderthon SoleMates 2026 · Boulder, Colorado

2026 Center of the Nation Series - Day 2 (CO) · Sterling, Colorado

Colorado Springs Marathon, Half, 5K, and Kids K · Colorado Springs, Colorado

Spooky Sprint - Denver · Littleton, Colorado

Bear Chase Race - Half Marathon & 10K · Lakewood, Colorado

Castle Rock Trail Festival · Castle Rock, Colorado

Rim to Rim Royal Gorge Races: 5K Road Run, Trail 8 Mile, Trail Half Marathon · Canon City, Colorado

Pretzel Run Colorado · Louisville, Colorado

Windsor Marathon, Half Marathon, 10k, 5k & 1 Mile Run · Windsor, Colorado

New Belgium Half Marathon and 5K · Fort Collins, Colorado

The Long View Marathon · Fort Collins, Colorado

Breckenridge Road Marathon · Breckenridge, Colorado

Breckenridge RunFest · Breckenridge, Colorado

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