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

Breckenridge RunFest

Breckenridge, Colorado, United States

10 Oct, 2026 (Sat) – 11 Oct, 2026

$25.00 - $120.00

Running

10K 5K 1.6K Marathon +1

The Long View Marathon

Fort Collins, Colorado, United States

10 Oct, 2026 (Sat)

$35.00 - $110.00

Running

Marathon Half-Marathon 5K

Durango Marathon

Durango, Colorado, United States

11 Oct, 2026 (Sun)

$30.00 - $140.00

Running

Marathon Half-Marathon 5K

Westy Half & 5k

Westminster, Colorado, United States

11 Oct, 2026 (Sun)

$45.00 - $70.00

Running

Half-Marathon 5K

Mancos Cowboy Half Marathon, 5K, and Fun Run

Mancos, Colorado, United States

24 Oct, 2026 (Sat)

Free - $65.00

Running

Half-Marathon 5K 1.6K

Halloween Trick or Trot Run 5K/10K/13.1 DENVER/AURORA

Centennial, Colorado, United States

31 Oct, 2026 (Sat)

$30.00 - $45.00

Running

5K 10K Half-Marathon 1.6K +2

PB&J Fuel Run 5K/10K/13.1 DENVER/AURORA

Centennial, Colorado, United States

31 Oct, 2026 (Sat)

$30.00 - $45.00

Running

5K 10K Half-Marathon 1.6K +2

All-Out Kooky-Spooky

Golden, Colorado, United States

01 Nov, 2026 (Sun)

$25.00 - $70.00

Running

Half-Marathon 10K 5K +2

Turkey Trails- Denver

Littleton, Colorado, United States

07 Nov, 2026 (Sat)

$22.00 - $61.00

Running

1.6K 5K 10K Half-Marathon

Turkey Trails - Colorado Springs

Colorado Springs, Colorado, United States

08 Nov, 2026 (Sun)

$22.00 - $48.00

Running

1.6K 5K 10K Half-Marathon

Veterans Day Freedom Run 5K/10K/13.1 DENVER/AURORA

Centennial, Colorado, United States

14 Nov, 2026 (Sat)

$30.00 - $45.00

Running

5K 10K Half-Marathon 1.6K +2

TURKEY TREK (13.1, 10k, 5k & 2k)

Arvada, Colorado, United States

21 Nov, 2026 (Sat)

$29.00 - $69.00

Running

Half-Marathon 10K 5K 2K