Race Calendar in Colorado, United States

Eat. Run. Adopt. 10K

Berthoud, Colorado, United States

08 Aug, 2026 (Sat)

$40.00

Running

10K

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)

Summer Sizzler- Colorado Springs

Colorado Springs, Colorado, United States

09 Aug, 2026 (Sun)

$22.00 - $34.00

Running

1.6K 5K 10K 15K

The Bullfrog Summer Surge

Lakewood, Colorado, United States

09 Aug, 2026 (Sun)

Free - $35.00

Running

5K 0.8K

Into the Hills Eltuck 10k

Bellvue, Colorado, United States

11 Aug, 2026 (Tue)

$25.00

Trail running

10K

Aug 13 - Beginners / Advanced @ Palmer

Colorado Springs, Colorado, United States

13 Aug, 2026 (Thu)

Aug 13 - Intermediate @ Red Rocks

Colorado Springs, Colorado, United States

13 Aug, 2026 (Thu)

South Fork Pandemonium

South Fork, Colorado, United States

14 Aug, 2026 (Fri) – 15 Aug, 2026

2026 CKF Leadville Trail 100 MTB

Leadville, Colorado, United States

15 Aug, 2026 (Sat)

Free

Mountain biking

Ultra

Farish Mt Bike Race

Woodland Park, Colorado, United States

15 Aug, 2026 (Sat)

$45.00 - $55.00

Mountain biking

9.7K 19.3K 25.7K

Run for PB& J 5K/10K/13.1 DENVER/AURORA

Centennial, Colorado, United States

15 Aug, 2026 (Sat)

$30.00 - $45.00

Running

5K 10K Half-Marathon 1.6K +2