Marathon races in Colorado, United States — 2026 running calendar

The Colorado Marathon

Fort Collins, Colorado, United States

02 May, 2027 (Sun)

Running

Marathon Half-Marathon 5K 10K

Weld Your Mettle Running Festival

Eaton, Colorado, United States

30 May, 2026 (Sat) – 31 May, 2026

Trail running, Running

Ultra 6.9K 22.5K Marathon +7

2026 CKF Cape Town Marathon

Aspen, Colorado, United States

24 May, 2026 (Sun)

Running

Marathon

Colfax Marathon

Lone Tree, Colorado, United States

17 May, 2026 (Sun)

Running

Marathon

Girls on the Run Rockies Colfax SoleMates 2026

Denver, Colorado, United States

17 May, 2026 (Sun)

Running

Marathon Half-Marathon

Race Through Colorado 1M, 5K, 10K, 13.1, 26.2 - Now Only $20!

Denver, Colorado, United States

28 Mar, 2026 (Sat) – 31 Dec, 2026

$20.00

Running

1.6K 5K 10K Half-Marathon +1