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

Byers Peak Stampede Half Marathon & 5K Run

Fraser, Colorado, United States

Aug 22, 2026 (Sat)

$65.00 - $85.00

Running

Half-Marathon 4.8K

Pioneer Prairie Dog Half, 10k & 5k

Westminster, Colorado, United States

Aug 23, 2026 (Sun)

$45.00 - $85.00

Running

Half-Marathon 10K 5K

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

Centennial, Colorado, United States

Aug 29, 2026 (Sat)

$30.00 - $45.00

Running

5K 10K Half-Marathon 1.6K +2

TBK Bank Thirsty 13 Half Marathon

Durango, Colorado, United States

Aug 29, 2026 (Sat)

$105.00 - $139.00

Running

Half-Marathon

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

Denver, Colorado, United States

Sep 5, 2026 (Sat)

$22.00 - $73.00

Running

5K 10K Half-Marathon 1.6K

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

Colorado Springs, Colorado, United States

Sep 6, 2026 (Sun)

$22.00 - $60.00

Running

1.6K 5K 10K Half-Marathon

Labor Day Half Marathon

Parker, Colorado, United States

Sep 7, 2026 (Mon)

$33.00 - $75.00

Running

Half-Marathon 10K 5K

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

Centennial, Colorado, United States

Sep 12, 2026 (Sat)

$30.00 - $45.00

Running

5K 10K Half-Marathon 1.6K +2

Black Squirrel Half Marathon

Bellvue, Colorado, United States

Sep 12, 2026 (Sat)

$110.00

Running

Half-Marathon

Autumn Run

Buena Vista, Colorado, United States

Sep 19, 2026 (Sat)

Free - $100.00

Running

Half-Marathon 10K 5K 1K

All-Out Fall Fest

Westminster, Colorado, United States

Sep 19, 2026 (Sat)

$35.00 - $80.00

Running

Half-Marathon 10K 5K +2

Beulah Challenge and OverIt Series

Beulah, Colorado, United States

Sep 19, 2026 (Sat)

$20.00 - $180.00

Running

Half-Marathon 10K 5K +2