Race Calendar in Colorado, United States

South Fork Alder Ass Race

South Fork, Colorado, United States

05 Sep, 2026 (Sat)

$65.00

Adventure race

17.7K 4.8K

Demon Dash

Arvada, Colorado, United States

05 Sep, 2026 (Sat)

$25.00

Running

5K

Break Your Neck: Walk, Run, or Roll

Pueblo, Colorado, United States

05 Sep, 2026 (Sat)

Free

Running

5K 10K

10k at 10,000 Feet

Steamboat Springs, Colorado, United States

06 Sep, 2026 (Sun)

$25.00 - $40.00

Running

12.9K 6.4K

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

Colorado Springs, Colorado, United States

06 Sep, 2026 (Sun)

$22.00 - $54.00

Running

1.6K 5K 10K Half-Marathon

Labor Day Half Marathon

Parker, Colorado, United States

07 Sep, 2026 (Mon)

$33.00 - $75.00

Running

Half-Marathon 10K 5K

Oak Creek No Fun Run

Oak Creek, Colorado, United States

07 Sep, 2026 (Mon)

$25.00

Running

5K

Sept 10 - Social Night Ride @ Stratton 5:30 pm *Lights Required!!

Colorado Springs, Colorado, United States

10 Sep, 2026 (Thu)

Flaming Foliage Relay - Idaho Springs to Buena Vista

Idaho Springs, Colorado, United States

11 Sep, 2026 (Fri) – 12 Sep, 2026

$752.00 - $2,090.00

Adventure race

Ultra

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

Centennial, Colorado, United States

12 Sep, 2026 (Sat)

$30.00 - $45.00

Running

5K 10K Half-Marathon 1.6K +2

Rampart Rager Gravel

Colorado Springs, Colorado, United States

12 Sep, 2026 (Sat)

$59.00

Gravel biking

Ultra

The Gunni Grinder

Gunnison, Colorado, United States

12 Sep, 2026 (Sat)

$70.00 - $130.00

Gravel biking

Ultra 48.3K