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

Sloth Run 5K/10K/13.1 DENVER/AURORA

Centennial, Colorado, United States

20 Jun, 2026 (Sat) – 29 Aug, 2026

$30.00 - $45.00

Running

5K 10K Half-Marathon 1.6K +8

Father's Day Classic 10k, 5k, & 1 Mile

Arvada, Colorado, United States

21 Jun, 2026 (Sun)

$10.00 - $45.00

Running

10K 5K 1.6K +2

Strawberry Shortcut

Glenwood Springs, Colorado, United States

21 Jun, 2026 (Sun)

$30.00 - $45.00

Running

10K 5K 1.6K

SBT TRL

Steamboat Springs, Colorado, United States

27 Jun, 2026 (Sat)

$35.75 - $55.75

Running

10K 5K

Let Freedom Run 5k/10k - Louisville

Louisville, Colorado, United States

04 Jul, 2026 (Sat)

$40.00 - $50.00

Running

5K 10K

July 4th Run 5K/10K/13.1 DENVER/AURORA

Centennial, Colorado, United States

04 Jul, 2026 (Sat)

$30.00 - $45.00

Running

5K 10K Half-Marathon 1.6K +2

Ourayce 10K Fun Run

Ouray, Colorado, United States

04 Jul, 2026 (Sat)

$35.00

Running

10K

Run for Chocolate 5K/10K/13.1 DENVER/AURORA

Centennial, Colorado, United States

04 Jul, 2026 (Sat)

$30.00 - $45.00

Running

5K 10K Half-Marathon 1.6K +2

Heatwave Half Marathon - Denver

Littleton, Colorado, United States

11 Jul, 2026 (Sat)

$22.00 - $73.00

Running

1.6K 5K 10K Half-Marathon +1

All-Out Dog Days

Westminster, Colorado, United States

11 Jul, 2026 (Sat)

$35.00 - $80.00

Running

Half-Marathon 10K 5K +2

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

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