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

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

Centennial, Colorado, United States

15 Aug, 2026 (Sat)

$30.00 - $45.00

Running

5K 10K Half-Marathon 1.6K +2

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

Centennial, Colorado, United States

15 Aug, 2026 (Sat) – 10 Oct, 2026

$30.00 - $45.00

Running

5K 10K Half-Marathon 1.6K +8

Erie Half & 5k

Erie, Colorado, United States

16 Aug, 2026 (Sun)

$45.00 - $70.00

Running

Half-Marathon 5K

Byers Peak Stampede Half Marathon & 5K Run

Fraser, Colorado, United States

22 Aug, 2026 (Sat)

$60.00 - $80.00

Running

Half-Marathon 4.8K

Staunton Rocks! Marathon and Half Marathon

Pine, Colorado, United States

22 Aug, 2026 (Sat)

$110.00 - $130.00

Running

Marathon Half-Marathon

Pioneer Prairie Dog Half, 10k & 5k

Westminster, Colorado, United States

23 Aug, 2026 (Sun)

$40.00 - $80.00

Running

Half-Marathon 10K 5K

TBK Bank Thirsty 13 Half Marathon

Durango, Colorado, United States

29 Aug, 2026 (Sat)

$99.00 - $134.00

Running

Half-Marathon

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

Centennial, Colorado, United States

29 Aug, 2026 (Sat)

$30.00 - $45.00

Running

5K 10K Half-Marathon 1.6K +2

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

Denver, Colorado, United States

05 Sep, 2026 (Sat)

$22.00 - $67.00

Running

5K 10K Half-Marathon 1.6K

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

Colorado Springs, Colorado, United States

06 Sep, 2026 (Sun)

$22.00 - $54.00

Running

1.6K 5K 10K Half-Marathon

Labor Day Half Marathon

Parker, Colorado, United States

07 Sep, 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

12 Sep, 2026 (Sat)

$30.00 - $45.00

Running

5K 10K Half-Marathon 1.6K +2