Running Race Calendar in Colorado, United States

Spring Creek Memorial Trail Run

Steamboat Springs, Colorado, United States

18 Jul, 2026 (Sat)

$35.75 - $50.75

Running

15.3K 5K

Summer Splash Prairie Dog Half, 10k, & 5k

Castle Rock, Colorado, United States

18 Jul, 2026 (Sat)

$45.00 - $85.00

Running

Half-Marathon 10K 5K

Heritage Eagles 5K

Littleton, Colorado, United States

18 Jul, 2026 (Sat)

$30.00

Running

5K

Barr Trail Mountain Race

Manitou Springs, Colorado, United States

19 Jul, 2026 (Sun)

Free - $500.00

Running

20.3K

One Is Too Many: Veteran Suicide Awareness 5k and Kids Run

Greeley, Colorado, United States

19 Jul, 2026 (Sun)

$20.00 - $35.00

Running

5K 1.6K

Clear for Takeoff Virtual 5K

Colorado Springs, Colorado, United States

20 Jul, 2026 (Mon) – 27 Jul, 2026

$35.00

Running

5K

BRR All-Comers Summer Track & Field Series #4

Boulder, Colorado, United States

23 Jul, 2026 (Thu)

Free - $20.00

Running

Ultra 3.2K

Flyin' Ryan Memorial 5k

Loveland, Colorado, United States

24 Jul, 2026 (Fri)

$25.00

Running

5K

Run for Coffee Lovers 5K/10K/13.1 DENVER/AURORA

Centennial, Colorado, United States

25 Jul, 2026 (Sat)

$30.00 - $45.00

Running

5K 10K Half-Marathon 1.6K +2

The Hero's Journey 5K

Aurora, Colorado, United States

25 Jul, 2026 (Sat)

$10.00 - $35.00

Running

5K 1K

Aspen Valley Marathon

Aspen, Colorado, United States

25 Jul, 2026 (Sat)

$80.00 - $240.00

Running

Marathon Half-Marathon 5K

Run for Donuts 5K/10K/13.1 DENVER/AURORA

Centennial, Colorado, United States

25 Jul, 2026 (Sat) – 26 Sep, 2026

$30.00 - $45.00

Running

5K 10K Half-Marathon 1.6K +8