10K races in Colorado, United States — 2026 running calendar

Ourayce 10K Fun Run

Ouray, Colorado, United States

Jul 4, 2026 (Sat)

Running

10K

SBT TRL

Steamboat Springs, Colorado, United States

Jun 27, 2026 (Sat)

Running

10K 5K

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

Strawberry Shortcut

Glenwood Springs, Colorado, United States

Jun 21, 2026 (Sun)

Running

10K 5K 1.6K

Father's Day Classic 10k, 5k, & 1 Mile

Arvada, Colorado, United States

Jun 21, 2026 (Sun)

Running

10K 5K 1.6K +2

Run Juneteenth Day 5K/10K/13.1 DENVER/AURORA

Centennial, Colorado, United States

Jun 20, 2026 (Sat)

Running

5K 10K Half-Marathon 1.6K +2

Red, White and Brew 5k, 10k & Half Marathon

Windsor, Colorado, United States

Jun 20, 2026 (Sat)

Running

5K 10K Half-Marathon 1.6K +2

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

Centennial, Colorado, United States

Jun 20, 2026 (Sat) – Aug 29, 2026

$30.00 - $45.00

Running

5K 10K Half-Marathon 1.6K +8

The Bullfrog Splashdown

Littleton, Colorado, United States

Jun 14, 2026 (Sun)

Running

10K 5K 2.4K 8.9K

Garden of the Gods 10 Mile/10K and Trail Run

Colorado Springs, Colorado, United States

Jun 14, 2026 (Sun)

Running, Trail running

16.1K 10K 4.7K

Treat Trot Colorado Springs

Colorado Springs, Colorado, United States

Jun 14, 2026 (Sun)

Running

1.6K 5K 10K 15K

Treat Trot - Denver

Thornton, Colorado, United States

Jun 13, 2026 (Sat)

Running

1.6K 5K 10K 15K