Race Calendar in Colorado, United States

The Denver 5k

Denver, Colorado, United States

Sep 12, 2026 (Sat)

$49.85

Running

5K

The Gunni Grinder

Gunnison, Colorado, United States

Sep 12, 2026 (Sat)

$70.00 - $130.00

Gravel biking

Ultra 48.3K

For The City Network 5K

Greeley, Colorado, United States

Sep 12, 2026 (Sat)

$45.00

Running

5K

Black Squirrel Half Marathon

Bellvue, Colorado, United States

Sep 12, 2026 (Sat)

$110.00

Running

Half-Marathon

National Chocolate Day: Run for Chocolates 5K/10K/13.1 DENVER/AURORA

Centennial, Colorado, United States

Sep 12, 2026 (Sat)

$30.00 - $45.00

Running

5K 10K Half-Marathon 1.6K +2

2026 Lake Nighthorse Triathlon - Sprint and Olympic

Durango, Colorado, United States

Sep 12, 2026 (Sat)

$95.00 - $140.00

Triathlon

25.8K Ultra +1

Trail Sisters Women's Half Marathon & 10k

Buena Vista, Colorado, United States

Sep 12, 2026 (Sat)

$65.00 - $100.00

Trail running

Half-Marathon 10K

Colorado Run for the Fallen Run/Walk/Ruck

Palmer Lake, Colorado, United States

Sep 13, 2026 (Sun)

RMRR September Trophy Series

Thornton, Colorado, United States

Sep 13, 2026 (Sun)

$10.00

Running

10K 5K

Buffalo Bicycle Classic

Boulder, Colorado, United States

Sep 13, 2026 (Sun)

$150.00 - $200.00

Cycling, Gravel biking

Ultra 22.5K +5

Rmrr Fall Marathon Training Series #2

Thornton, Colorado, United States

Sep 13, 2026 (Sun)

$20.00 - $30.00

Running

20K 30K

Honey Bee Hustle

Loveland, Colorado, United States

Sep 13, 2026 (Sun)