Running Race Calendar in Colorado, United States

Apex Foundation Trick or Trot 5K & Halloween Hunt

Arvada, Colorado, United States

24 Oct, 2026 (Sat)

$10.00 - $35.00

Running

5K 1.6K

Race to Cure Sarcoma Denver

Denver, Colorado, United States

24 Oct, 2026 (Sat)

$10.00 - $35.00

Running

5K 1K +2

Mancos Cowboy Half Marathon, 5K, and Fun Run

Mancos, Colorado, United States

24 Oct, 2026 (Sat)

Free - $65.00

Running

Half-Marathon 5K 1.6K

Ghosts and Goblins 5K/10K

Denver, Colorado, United States

25 Oct, 2026 (Sun)

$30.00 - $40.00

Running

5K 10K

The 14th Annual Odyssey Odyssey - 2026

Denver, Colorado, United States

25 Oct, 2026 (Sun)

Free

Running

5K 1.6K

Halloween Trick or Trot Run 5K/10K/13.1 DENVER/AURORA

Centennial, Colorado, United States

31 Oct, 2026 (Sat)

$30.00 - $45.00

Running

5K 10K Half-Marathon 1.6K +2

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

Centennial, Colorado, United States

31 Oct, 2026 (Sat)

$30.00 - $45.00

Running

5K 10K Half-Marathon 1.6K +2

Spooky Sprint - Colorado Springs

Colorado Springs, Colorado, United States

31 Oct, 2026 (Sat)

$22.00 - $30.00

Running

1.6K 5K 10K

I Ain't Scared (of 5k)

Thornton, Colorado, United States

31 Oct, 2026 (Sat)

$40.00

Running

5K

Foundry Halloween 5k

Steamboat Springs, Colorado, United States

31 Oct, 2026 (Sat)

$25.75

Running

5K

Halloween Fun Run 5k & 1mile - Zombie Theme

Idaho Springs, Colorado, United States

31 Oct, 2026 (Sat)

$20.00

Running

5K 1.6K

All-Out Kooky-Spooky

Golden, Colorado, United States

01 Nov, 2026 (Sun)

$25.00 - $70.00

Running

Half-Marathon 10K 5K +2