Running Race Calendar in Colorado, United States

Eltuck Valley 5K - Lory Summer Trail Series

Fort Collins, Colorado, United States

04 Aug, 2026 (Tue)

$25.00

Running

5K

Eldorado Run for the Cure

Eldorado Springs, Colorado, United States

06 Aug, 2026 (Thu)

$30.00

Running

6.4K

BRR All-Comers Summer Track & Field Series #5

Boulder, Colorado, United States

06 Aug, 2026 (Thu)

$20.00

Running

Ultra 1.6K

RMRR August Trophy Series

Centennial, Colorado, United States

07 Aug, 2026 (Fri)

$10.00

Running

5K

Choice City Running Festival

Fort Collins, Colorado, United States

07 Aug, 2026 (Fri) – 08 Aug, 2026

Free - $71.00

Running

1.6K 5K 10K Half-Marathon +4

Leadville Boomdays International Pack Burro Race

Leadville, Colorado, United States

08 Aug, 2026 (Sat)

$65.00 - $80.00

Running

33.8K 12.9K

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

Dog Days Of Summer 2026

Longmont, Colorado, United States

08 Aug, 2026 (Sat)

$20.00 - $35.00

Running

5.6K 1K

Arapahoe Warrior 5K

Centennial, Colorado, United States

08 Aug, 2026 (Sat)

$27.50

Running

5K

All-Out Runapalooza

Arvada, Colorado, United States

08 Aug, 2026 (Sat)

$40.00 - $353.00

Running

Half-Marathon 10K 5K +2

The Bullfrog Summer Surge

Lakewood, Colorado, United States

09 Aug, 2026 (Sun)

Free - $40.00

Running

5K 0.8K