All races in Colorado

Upcoming marathons in Colorado

8 marathons are coming up in Colorado, out of 260 races on the statewide calendar. Compare dates, distances and locations, then get ready with a personalized training plan.

8 upcoming races

September 2026

Sep 27, 2026Boulderthon Boulder Marathon📍 Boulder, CO26.2 mi · 13.1 mi · 6.2 mi · 3.1 mi
Sep 27, 2026Boulderthon 📍 Boulder, CO26.2 mi · 13.1 mi · 6.2 mi · 3.1 mi
Sep 28, 2026Center of the Nation Series - Day 1📍 Sterling, CO26.2 mi · 13.1 mi · 6.2 mi · 3.1 mi

October 2026

Oct 10, 2026Breckenridge Road Marathon📍 Breckenridge, CO26.2 mi · 13.1 mi · 6.2 mi · 3.1 mi

November 2026

Nov 1, 2026Rim Rock Marathon📍 Grand Junction, CO26.2 mi · 13.1 mi

May 2027

May 2, 2027Colorado Marathon📍 Colorado Springs, CO26.2 mi · 13.1 mi · 6.2 mi · 3.1 mi
May 15, 2027Marathon de Denver📍 Denver, CO26.2 mi · 26.2 mi · 13.1 mi · 6.2 mi

July 2027

Jul 17, 2027Aspen Valley Marathon📍 Aspen, CO26.2 mi · 13.1 mi · 3.1 mi

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