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

Oct

03

Colorado Springs Marathon, Half, 5K, and Kids K

Colorado Springs, Colorado, United States

Free - $130.00

Running

Marathon Half-Marathon 5K 1K +11

Oct

03

Ethiopians 5K

Aurora, Colorado, United States

Free

Running

5K

Oct

03

Ethiorado 5K Run/Walk

Aurora, Colorado, United States

$80.00

Running

5K

Oct

04

Strides for Sierra 5K run/walk

Arvada, Colorado, United States

$10.00 - $100.00

Running

5K 1K

Oct

04

Windsor Marathon, Half Marathon, 10k, 5k & 1 Mile Run

Windsor, Colorado, United States

$20.00 - $140.00

Running

Marathon Half-Marathon 10K 5K +1

Oct

04

Liberty Energy 5K - Benefiting the Bettering Human Lives Foundation

Denver, Colorado, United States

Free - $35.00

Running

5K 1K Post-Race Celebration Pass

Oct

04

RMRR October Trophy Series

Aurora, Colorado, United States

$10.00

Running

12.9K 5K

Oct

10

Faith & Blue 5K

Fort Morgan, Colorado, United States

Free

Running

5K

Oct

10

Breckenridge RunFest

Breckenridge, Colorado, United States

$30.00 - $130.00

Running

10K 5K 1.6K Marathon +1

Oct

10

Dialysis Dash 5K

Grand Junction, Colorado, United States

$30.00

Running

5K

Oct

10

Kipling Villas 5K -

Littleton, Colorado, United States

$15.00

Running

5K

Oct

10

Footsteps for Families 5k Fun Run & Concert

Windsor, Colorado, United States

$25.00 - $50.00

Running

5K