Marathons in Colorado, United States 2026
42.2 kilometres (26.2 miles) — the classic endurance test. Browse upcoming events in United States.
12 upcoming races
Upcoming Races
Running
Aspen Backcountry Marathon
Aug 1, 2026Aspen, USA
Run 42 m
Running
Bound for Boston Marathon & Half Marathon - Denver
Aug 2, 2026Denver, USA
Run 42 m
Running
Georgetown to Idaho Springs Half Marathon 2026
Aug 8, 2026Idaho Springs, USA
Run 21 m
Running
2026 Mt. Sneffels Half Marathon-10K-Kids-Fun Run
Aug 15, 2026Ridgway, USA
Run 10 m
Running
Deep Creek Trail Half Marathon
Sep 26, 2026Telluride, USA
Run 21 m
Running
Colorado Springs Marathon, Half, 5K, and Kids K
Oct 3, 2026Colorado Springs, USA
Run 42 m
Running
Boulder Marathon
Oct 4, 2026Boulder, USA
Run 42 m
Running
Durango Marathon
Oct 11, 2026Durango, USA
Run 42 m
Running
Blue Sky Trail Marathon & Half Marathon
Oct 17-18, 2026Fort Collins, USA
Run 42 m
Running
Marathon At The MAC
Nov 7, 2026Castle Rock, USA
Run 42 m
Running
22nd Annual Run Through Time Trail Marathon and Half Marathon
Mar 13, 2027Salida, USA
Run 42 m
Running
All-Out Beat the Heat
Apr 24, 2027Westminster, USA
Run 5 m