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

Oct

21

DU Crimson Classic 5K Run/1.5 Mile Walk

Denver, Colorado, United States

Free

Running

5K 2.4K Volunteer One Hour - Day of Crimson Classic +6

Oct

22

4A Region 3 XC State Qualifier

Northglenn, Colorado, United States

Running

5K

Oct

22

Chsaa XC Regionals Arvada

Arvada, Colorado, United States

Running

5K +2

Oct

22

Chsaa XC Regionals - Aurora

Aurora, Colorado, United States

Running

5K

Oct

23

Colorado 2A Region 4

Mancos, Colorado, United States

Running

5K

Oct

23

Chsaa XC Regionals Denver

Denver, Colorado, United States

Running

5K

Oct

24

Zedikiah Scholarship 5K

Denver, Colorado, United States

Free

Running

5K

Oct

24

Ymca Creepy Crawl 5K

Palmer Lake, Colorado, United States

Free - $45.00

Running

5K 1.3K

Oct

24

Hoofin' It Through the Hollows 5K

Centennial, Colorado, United States

$20.00

Running

5K

Oct

24

Ymca of Pueblo Race Series

Pueblo, Colorado, United States

$80.00

Running

5K

Oct

24

Apex Foundation Trick or Trot 5K & Halloween Hunt

Arvada, Colorado, United States

$10.00 - $45.00

Running

5K 1.6K

Oct

24

YMCA of Pueblo Spooky Sprint 5K

Pueblo, Colorado, United States

$50.00

Running

5K