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

National Chocolate Day: Run for Chocolates 5K/10K/13.1 DENVER/AURORA

Centennial, Colorado, United States

12 Sep, 2026 (Sat)

$30.00 - $45.00

Running

5K 10K Half-Marathon 1.6K +2

6 Dot Dash

Littleton, Colorado, United States

12 Sep, 2026 (Sat)

$40.00

Running

5K

9/11 Heroes Run - Denver, Colorado

Denver, Colorado, United States

13 Sep, 2026 (Sun)

Free - $40.00

Running

5K 1.6K +3

RMRR September Trophy Series

Thornton, Colorado, United States

13 Sep, 2026 (Sun)

$10.00

Running

10K 5K

Severance Glow 5K Run or Walk

Severance, Colorado, United States

18 Sep, 2026 (Fri)

$35.00

Running

5K

Miles 4 Madison 5K & 1K

Littleton, Colorado, United States

19 Sep, 2026 (Sat)

$25.00

Running

5K 1K

All-Out Fall Fest

Westminster, Colorado, United States

19 Sep, 2026 (Sat)

$25.00 - $70.00

Running

Half-Marathon 10K 5K +2

Gummball 5K

Brighton, Colorado, United States

19 Sep, 2026 (Sat)

$30.00

Running

5K

Beulah Challenge and OverIt Series

Beulah, Colorado, United States

19 Sep, 2026 (Sat)

$20.00 - $180.00

Running

Half-Marathon 10K 5K +2

Denver: Walk With Autism and Resource Fair

Denver, Colorado, United States

19 Sep, 2026 (Sat)

$25.00

Running

5K

Autumn Run

Buena Vista, Colorado, United States

19 Sep, 2026 (Sat)

Free - $90.00

Running

Half-Marathon 10K 5K 1K

Wellington STAR Foundation 5K 10K

Wellington, Colorado, United States

19 Sep, 2026 (Sat)

$15.00 - $53.00

Running

5K 10K +2