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Races in Colorado - September 2026

Browse 90+ upcoming races in Colorado for September 2026.

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Races in Colorado - September 2026

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Front Range Ultra Dayze

Sep 3, 2026
Loveland, CO
100HR72HR200M48HR100M24HR12HR31.1M
85°
49°
4%

Golden Harvest Half Marathon & 5k/10k - Denver

Sep 5, 2026
Denver, CO
50M13.1M6.2M3.1M1M
86°
54°
5%

Cirque Series - Arapahoe Basin

Sep 5, 2026
Keystone, CO
8.8M
71°
33°
6%

South Fork Alder Ass Race

Sep 5, 2026
South Fork, CO
11M11M3M
76°
43°
4%

South Boulder Creek parkrun

Sep 5, 2026
Boulder, CO
5K
85°
53°
6%

Grand Traverse Mountain Run

Sep 5, 2026
Crested Butte, CO
40M
71°
34°
7%

Cirque Series - Arapahoe Basin, CO

Sep 5, 2026
Keystone, CO
9.4M
71°
33°
6%

Nielson Two Mile Challenge

Sep 5, 2026
Colorado Springs, CO
2M
82°
54°
6%

Creede Mountain Run

Sep 5, 2026
Loveland, CO
31.1M22M12M2M
84°
49°
4%

10K at 10,000 Feet Trail Run

Sep 6, 2026
Steamboat Springs, CO
10K5K
80°
44°
7%

10k at 10,000 Feet

Sep 6, 2026
Steamboat Springs, CO
8M4M
80°
44°
7%

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

Sep 6, 2026
Colorado Springs, CO
50M13.1M6.2M3.1M1M
82°
54°
6%

Labor Day Half Marathon

Sep 7, 2026
Parker, CO
13.1M10K5K
82°
53°
6%

Oak Creek No Fun Run

Sep 7, 2026
Oak Creek, CO
5K
75°
40°
5%

Lakewood Trail Running Series

Sep 9, 2026
Lakewood, CO
7M
83°
49°
5%

Flaming Foliage Relay - Idaho Springs to Buena Vista

Sep 11, 2026
Idaho Springs, CO
165M
72°
41°
6%

The Denver 5k

Sep 12, 2026
Denver, CO
5K
83°
51°
5%

Trail Sisters Women's Half Marathon & 10k

Sep 12, 2026
Buena Vista, CO
13.1M10K
77°
42°
5%

Spirit of the Valley 5K

Sep 12, 2026
Grand Junction, CO
5K1M
85°
55°
4%

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

Sep 12, 2026
Centennial, CO
13.1M10K5K1M
80°
52°
6%