10K races in Colorado, United States — 2026 running calendar

Sep

05

Break Your Neck: Walk, Run, or Roll

Pueblo, Colorado, United States

Free

Running

5K 10K

Sep

05

The Beaver Run

Breckenridge, Colorado, United States

Free - $50.00

Running

5K 10K 15K 0.2K

Sep

05

Golden Harvest Half Marathon & 5k/10k - Denver

Denver, Colorado, United States

$22.00 - $85.00

Running

5K 10K Half-Marathon 1.6K

Sep

06

Golden Harvest Half Marathon & 5k/10k - Colorado Springs

Colorado Springs, Colorado, United States

$22.00 - $72.00

Running

1.6K 5K 10K Half-Marathon

Sep

07

Labor Day Half Marathon

Parker, Colorado, United States

$36.00 - $80.00

Running

Half-Marathon 10K 5K

Sep

10

14th Annual Superhero Event

Greeley, Colorado, United States

Free - $40.00

Running

10K 5K 1.6K Kid's Fun Run (Ages 6 & Under) +5

Sep

12

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

Centennial, Colorado, United States

$30.00 - $45.00

Running

5K 10K Half-Marathon 1.6K +2

Sep

13

RMRR September Trophy Series

Thornton, Colorado, United States

$10.00

Running

10K 5K

Sep

19

Beulah Challenge and OverIt Series

Beulah, Colorado, United States

$20.00 - $190.00

Running

Half-Marathon 10K 5K +2

Sep

19

All-Out Fall Fest

Westminster, Colorado, United States

$35.00 - $80.00

Running

Half-Marathon 10K 5K +2

Sep

19

Autumn Run

Buena Vista, Colorado, United States

Free - $100.00

Running

Half-Marathon 10K 5K 1K

Sep

19

Wellington STAR Foundation 5K 10K

Wellington, Colorado, United States

$15.00 - $57.00

Running

5K 10K +2