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

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

Louisville, Colorado, United States

Jun 7, 2026 (Sun)

Running

Half-Marathon 10K 5K

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

Centennial, Colorado, United States

Jun 6, 2026 (Sat) – Dec 12, 2026

$30.00 - $45.00

Running

5K 10K Half-Marathon 1.6K +8

Steamworks Half Marathon

Durango, Colorado, United States

Jun 6, 2026 (Sat)

Running

Half-Marathon

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

Centennial, Colorado, United States

Jun 6, 2026 (Sat)

Running

5K 10K Half-Marathon 1.6K +2

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

Centennial, Colorado, United States

May 23, 2026 (Sat)

Running

5K 10K Half-Marathon 1.6K +2

Run for Mental Health 5K/10K/13.1 DENVER/AURORA

Centennial, Colorado, United States

May 23, 2026 (Sat) – Nov 14, 2026

$30.00 - $45.00

Running

5K 10K Half-Marathon 1.6K +14

Girls on the Run Rockies Colfax SoleMates 2026

Denver, Colorado, United States

May 17, 2026 (Sun)

Running

Marathon Half-Marathon

Hometown Half Marathon & 5k/10k - Denver

Littleton, Colorado, United States

May 10, 2026 (Sun)

Running

1.6K 5K 10K Half-Marathon +1

Super Mom 5K/10K/Half - Colorado Springs

Colorado Springs, Colorado, United States

May 10, 2026 (Sun)

Running

5K 10K Half-Marathon +5

Hometown Half Marathon & 5k/10k - Colorado Springs

Colorado Springs, Colorado, United States

May 9, 2026 (Sat)

Running

5K 10K Half-Marathon 1.6K +2

Longmont Half & 5k (LM Half)

Longmont, Colorado, United States

May 3, 2026 (Sun)

Running

Half-Marathon 5K

Sunrise Marathon 5K/10K/13.1 DENVER/AURORA

Centennial, Colorado, United States

May 2, 2026 (Sat)

Running

5K 10K Half-Marathon 1.6K +2