Running Race Calendar in Colorado, United States

Cinco De Mayo Run 5K/10K/13.1 DENVER/AURORA

Centennial, Colorado, United States

02 May, 2026 (Sat)

Running

5K 10K Half-Marathon 1.6K +2

Sunrise Marathon 5K/10K/13.1 DENVER/AURORA

Centennial, Colorado, United States

02 May, 2026 (Sat)

Running

5K 10K Half-Marathon 1.6K +2

High Line Canal 5K/10K Run

Centennial, Colorado, United States

02 May, 2026 (Sat)

Running

10K 5K

DU Spring Sprint 5k

Gunnison, Colorado, United States

02 May, 2026 (Sat)

Running

5.1K

MayFest Fun Run

Parachute, Colorado, United States

02 May, 2026 (Sat)

Running

5.5K

Greenland Trail Races

Larkspur, Colorado, United States

02 May, 2026 (Sat)

Trail running, Running

Ultra 25K 12.9K 6.4K +2

Take 5 in the Garden

Colorado Springs, Colorado, United States

02 May, 2026 (Sat)

Trail running, Running

15.3K 8K 5K

2026 Dash & Dine 5k Run Series

Boulder, Colorado, United States

28 Apr, 2026 (Tue) – 19 May, 2026

Running

5K

Alpine Autism Center 19th Annual "Run for the One" 5k Walk/Run

Colorado Springs, Colorado, United States

25 Apr, 2026 (Sat) – 01 May, 2026

Running

5K

Healthy Kids Running Series Spring 2026 - Denver, CO

Denver, Colorado, United States

12 Apr, 2026 (Sun) – 17 May, 2026

Running

6.4K 3.2K 1.6K

Healthy Kids Running Series Spring 2026 - Aurora, CO

Aurora, Colorado, United States

12 Apr, 2026 (Sun) – 17 May, 2026

Running

6.4K 3.2K 1.6K

Prairie Dog Run Series

Louisville, Colorado, United States

12 Apr, 2026 (Sun) – 23 Aug, 2026

Running

Half-Marathon