Upcoming half marathons in Colorado

13 half 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.

13 upcoming races

September 2026

Sep 19, 2026Run The Rockies📍 Copper Mountain, CO13.1 mi · 6.2 mi
Sep 20, 2026Fall Equinox📍 Fort Collins, CO13.1 mi · 5 mi
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

April 2027

Apr 24, 2027All-Out Beat the Heat 1M, 5K, 10K, Half Marathon & Marathon📍 Westminster, CO3.1 mi · 6.2 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

June 2027

Jun 12, 2027Barr Lake Trail Race📍 Brighton, CO31.1 mi · 18.6 mi · 13.1 mi · 9.3 mi
Jun 26, 2027Slacker Race📍 Denver, CO13.1 mi · 13.1 mi

July 2027

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

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