Running Race Calendar in Colorado, United States

Blue Sky Ascent & Round Trip (formerly the Mt. Evans Ascent)

Idaho Springs, Colorado, United States

Jun 28, 2026 (Sun)

Running

23.3K 46.7K

Slacker Half Marathon-Relay-4-Mile Races

Georgetown, Colorado, United States

Jun 27, 2026 (Sat)

Running

Half-Marathon 6.4K +3

Timberview Trail Run

Bellvue, Colorado, United States

Jun 27, 2026 (Sat)

Running

16.1K 5K 8K

Denver Pride 5K

Denver, Colorado, United States

Jun 27, 2026 (Sat)

Running

5K

Before The Fourth 5k

Littleton, Colorado, United States

Jun 27, 2026 (Sat)

Running

5K

SBT TRL

Steamboat Springs, Colorado, United States

Jun 27, 2026 (Sat)

Running

10K 5K

Fitness Expo On Tap at the Colorado Tap House

Arvada, Colorado, United States

Jun 27, 2026 (Sat)

Running

5K FREE Yoga On Tap 1.6K I want the Event Shirt! +1

Trail Town Races

Ridgway, Colorado, United States

Jun 27, 2026 (Sat)

Running

8K 16.1K

Pearl Street Mile

Boulder, Colorado, United States

Jun 27, 2026 (Sat)

Running

1.6K

The Four Legged 5k

Bailey, Colorado, United States

Jun 26, 2026 (Fri)

Running

5K

BRR All-Comers Summer Track & Field Series #2

Boulder, Colorado, United States

Jun 25, 2026 (Thu)

Running

3K

Race in the Clouds - Alma Dirt Festival

Alma, Colorado, United States

Jun 25, 2026 (Thu) – Jun 27, 2027

Mountain biking, Duathlon, Trail running, Running

Ultra Marathon Half-Marathon 35.4K +16