Race Calendar in Colorado, United States

Summer Sizzler- Denver

Thornton, Colorado, United States

08 Aug, 2026 (Sat)

$22.00 - $36.00

Running

1.6K 5K 10K 15K

Fort Collins Running Summit

Fort Collins, Colorado, United States

08 Aug, 2026 (Sat)

Eat. Run. Adopt. 10K

Berthoud, Colorado, United States

08 Aug, 2026 (Sat)

$40.00

Running

10K

Pat's Pony Express

Woodland Park, Colorado, United States

08 Aug, 2026 (Sat)

$65.00 - $80.00

Trail running

12.9K 25.7K 22.5K

Leadville Boomdays International Pack Burro Race

Leadville, Colorado, United States

08 Aug, 2026 (Sat)

$65.00 - $80.00

Running

33.8K 12.9K

Arapahoe Warrior 5K

Centennial, Colorado, United States

08 Aug, 2026 (Sat)

$25.00

Running

5K

Dog Days Of Summer 2026

Longmont, Colorado, United States

08 Aug, 2026 (Sat)

$20.00 - $35.00

Running

5.6K 1K

HRCA Splash Mash Dash Kids Triathlon

Littleton, Colorado, United States

08 Aug, 2026 (Sat)

The Bullfrog Summer Surge

Lakewood, Colorado, United States

09 Aug, 2026 (Sun)

Free - $35.00

Running

5K 0.8K

Summer Sizzler- Colorado Springs

Colorado Springs, Colorado, United States

09 Aug, 2026 (Sun)

$22.00 - $34.00

Running

1.6K 5K 10K 15K

Pancake Stampede 5K

Littleton, Colorado, United States

09 Aug, 2026 (Sun)

$20.00

Running

5K

Into the Hills Eltuck 10k

Bellvue, Colorado, United States

11 Aug, 2026 (Tue)

$25.00

Trail running

10K