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Half Marathon Races in Colorado

Browse 232+ upcoming half marathon races in Colorado.

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Time to Paddy 5k/10k & Lucky 13.1 - Denver

Feb 28, 2026
Westminster, CO
13.1M6.2M3.1M1M
51°
22°
3%

Time to Paddy 5K/10K and Lucky 13.1

Feb 28, 2026
Westminster, CO
13.1M10K5K1M
51°
22°
3%

Time to Paddy 5k/10k & Lucky 13.1 - Colorado Springs

Mar 1, 2026
Colorado Springs, CO
13.1M6.2M3.1M1M
50°
23°
1%

That Dam Run

Mar 1, 2026
Aurora, CO
13.1M10K5K
48°
22°
2%

Time to Paddy 5K/10K and Lucky 13.1

Mar 1, 2026
Colorado Springs, CO
13.1M10K5K1M
50°
23°
1%

SuperHeroes Run 5K/10K/13.1 DENVER/AURORA

Mar 7, 2026
Centennial, CO
13.1M10K5K1M
51°
25°
3%

Run for Mental Health 5K/10K/13.1 DENVER/AURORA

Mar 7, 2026
Centennial, CO
13.1M10K5K1M
51°
25°
3%

St. Paddy's Day Lucky Run 5K/10K/13.1 DENVER/AURORA

Mar 14, 2026
Centennial, CO
13.1M10K5K1M
55°
28°
4%

21st Annual Run Through Time Trail Marathon and Half Marathon

Mar 14, 2026
Salida, CO
26.2M13.1M2M
51°
21°
2%

Lucky Brew Race 5K, 10K, 15k & Half Marathon

Mar 14, 2026
Severance, CO
13.1M9.3M10K5K
56°
27°
3%

Lucky Brew Race

Mar 14, 2026
Severance, CO
13.1M9.3M10K5K
56°
27°
3%

Run Through Time Marathon

Mar 14, 2026
Salida, CO
26.2M13.1M2M
51°
21°
2%

Sloth Run 5K/10K/13.1 DENVER/AURORA

Mar 14, 2026
Centennial, CO
13.1M10K5K1M
55°
28°
4%

All-Out Spring Fever

Mar 22, 2026
Golden, CO
13.1M10K5K
58°
33°
8%

The City Park Circuit

Mar 28, 2026
Denver, CO
400M2M
62°
32°
5%

The City Park Circuit, Presented by New Balance

Mar 28, 2026
Denver, CO
400M2M
62°
32°
5%

RMRR Spring Marathon Training Series

Mar 29, 2026
Thornton, CO
20M10M
64°
33°
6%

Spring Equinox

Mar 29, 2026
Wellington, CO
13.1M5K
61°
32°
4%

Spring Equinox Half Marathon and 5K

Mar 29, 2026
Fort Collins, CO
13.1M5K
62°
33°
5%

RMRR Spring Marathon Training Series #1

Mar 29, 2026
Thornton, CO
40M20M10M
64°
33°
6%
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