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Half Marathon Races in Colorado (Page 5)

Browse 129+ upcoming half marathon races in Colorado.

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Boulderthon: Downtown Boulder Marathon

Sep 27, 2026
Boulder, CO
26.2M13.1M10K5K
74°
44°
7%

RMRR Fall Marathon Training Series

Sep 27, 2026
Thornton, CO
20M10M
76°
45°
5%

Center of the Nation Series - Day 2

Sep 29, 2026
Sterling, CO
26.2M13.1M
71°
41°
4%

Above the Clouds Ultra

Oct 3, 2026
Woodland Park, CO
31.1M10K
59°
31°
5%

Sage Burner Trail Race

Oct 3, 2026
Gunnison, CO
31.1M17.4M9.3M
66°
28°
3%

Rim to Rim Royal Gorge Races

Oct 3, 2026
Cañon City, CO
13.1M8M5K
73°
42°
3%

Sage Burner Trail Run

Oct 3, 2026
Gunnison, CO
31.1M17.4M8.1M5K
66°
28°
3%

Spooky Sprint

Oct 3, 2026
Denver, CO
13.1M10K5K1M
71°
41°
5%

Colorado Springs Marathon

Oct 3, 2026
Colorado Springs, CO
26.2M13.1M5K
70°
42°
4%

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

Oct 3, 2026
Colorado Springs, CO
26.2M13.1M5K3.1M0.6M
70°
42°
4%

Spooky Sprint - Denver

Oct 3, 2026
Denver, CO
50M13.1M6.2M3.1M1M
71°
41°
5%

Bear Chase Race - Half Marathon and 10K

Oct 3, 2026
Lakewood, CO
13.1M10K5K
70°
38°
6%

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

Oct 3, 2026
Cañon City, CO
13.1M8M10K5K
73°
42°
3%

The Bear Chase

Oct 4, 2026
Lakewood, CO
62.1M50M31.1M1/2 Marathon
70°
38°
6%

Colorado Brewery Running Series - New Belgium Half Marathon and 5K

Oct 4, 2026
Fort Collins, CO
13.1M5K
69°
41°
5%

Pretzel Run Colorado

Oct 10, 2026
Louisville, CO
13.1M10K5K
68°
39°
7%

The Long View Marathon

Oct 10, 2026
Fort Collins, CO
26.2M13.1M5K
66°
38°
5%

Breckenridge Road Marathon

Oct 10, 2026
Breckenridge, CO
26.2M13.1M10K
56°
23°
3%

Durango Marathon

Oct 11, 2026
Durango, CO
26.2M13.1M
66°
33°
6%

Westy Half and 5k

Oct 11, 2026
Westminster, CO
13.1M5K
68°
38°
5%
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