5K races in Colorado, United States — 2026 running calendar

All-Out Dog Days

Westminster, Colorado, United States

11 Jul, 2026 (Sat)

$35.00 - $80.00

Running

Half-Marathon 10K 5K +2

Cookie Chase

Denver, Colorado, United States

11 Jul, 2026 (Sat)

$33.00

Running

5K

Heatwave Half Marathon - Colorado Springs

Colorado Springs, Colorado, United States

12 Jul, 2026 (Sun)

$22.00 - $60.00

Running

1.6K 5K 10K Half-Marathon +1

PNAAF 5K Wellness Challenge

Colorado Springs, Colorado, United States

16 Jul, 2026 (Thu)

$35.00

Running

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

CU Anschutz Run Club 5K

Aurora, Colorado, United States

18 Jul, 2026 (Sat)

$7.00 - $20.00

Running

5K

49th Annual Manassa Pioneer Days 5K Run

Manassa, Colorado, United States

18 Jul, 2026 (Sat)

$20.00

Running

5K

Heritage Eagles 5K

Littleton, Colorado, United States

18 Jul, 2026 (Sat)

$30.00

Running

5K

Spring Creek Memorial Trail Run

Steamboat Springs, Colorado, United States

18 Jul, 2026 (Sat)

$35.75 - $50.75

Running

15.3K 5K

2026 OCA Colorado 5K Panda Run

Denver, Colorado, United States

18 Jul, 2026 (Sat)

$35.00

Running, Walking

5K 1K

Festival in the Clouds Firefighter 5K, Fun Run and Doggie Dash

Alma, Colorado, United States

18 Jul, 2026 (Sat)

Free - $30.00

Running

5K

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