Half-Marathon races in Colorado, United States — 2026 running calendar

Steamworks Half Marathon

Durango, Colorado, United States

06 Jun, 2026 (Sat)

Running

Half-Marathon

Run for Breast Cancer 5K/10K/13.1 DENVER/AURORA

Centennial, Colorado, United States

06 Jun, 2026 (Sat) – 12 Dec, 2026

$30.00 - $45.00

Running

5K 10K Half-Marathon 1.6K +8

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

Centennial, Colorado, United States

06 Jun, 2026 (Sat)

$30.00 - $45.00

Running

5K 10K Half-Marathon 1.6K +2

The Steamboat Marathon

Steamboat Springs, Colorado, United States

07 Jun, 2026 (Sun)

$85.00 - $170.00

Running

Marathon Half-Marathon 10K

Colorado 13er (Half Marathon/10k/5k)

Louisville, Colorado, United States

07 Jun, 2026 (Sun)

$45.00 - $75.00

Running

Half-Marathon 10K 5K

All-Out Summer Breeze

Arvada, Colorado, United States

13 Jun, 2026 (Sat)

$40.00 - $85.00

Running

Half-Marathon 10K 5K +2

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

Run Juneteenth Day 5K/10K/13.1 DENVER/AURORA

Centennial, Colorado, United States

20 Jun, 2026 (Sat)

$30.00 - $45.00

Running

5K 10K Half-Marathon 1.6K +2

Red, White and Brew 5k, 10k & Half Marathon

Windsor, Colorado, United States

20 Jun, 2026 (Sat)

$15.00 - $90.00

Running

5K 10K Half-Marathon 1.6K +2

Slacker Half Marathon-Relay-4-Mile Races

Georgetown, Colorado, United States

27 Jun, 2026 (Sat)

$35.00 - $150.00

Running

Half-Marathon 6.4K +3

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

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