Colorado

Colorado Marathon Calendar 2026-2027

Monthly updates for Colorado

Get new running races (and updates) in your inbox every month.

Explore the best marathons in Colorado for 2026-2027! Our updated list features 22 exciting races across the region. Find your next race in Colorado below and join the running community at these great events!

Marathon Calendar United States

September 2026

Sep

11-12

Fr - Sa

American Heroes Run

Longmont, Colorado

Trail Run 5 km 9 mi ... 551 min 100 mi

Sep

Steele Trap Trail Run

Loma, Colorado

Trail Run 13 mi 26 mi 50 mi

Sep

Pikes Peak Marathon

Manitou Springs, Colorado

Trail Run 26 mi

Sep

Run Boulderthon: The Boulder Marathon

Boulder, Colorado

5 km 10 km Half Marathon Marathon

October 2026

Oct

Colorado Springs Marathon

Colorado Springs, Colorado

5 km 13 mi 26 mi

Monthly updates for Colorado

Get new running races (and updates) in your inbox every month.

Oct

West Elk Challenge

Crawford, Colorado

Trail Run 30 km 26 mi

Oct

Bataan Death March Colorado

Larkspur, Colorado

Road Race Trail Run 13 mi 26 mi

Oct

Windsor Marathon

Windsor, Colorado

5 km 10 km Half Marathon Marathon

Oct

The Long View Marathon

Fort Collins, Colorado

5 km 13 mi 26 mi

Oct

10-11

Sa - Su

Breckenridge RunFest

Breckenridge, Colorado

5 km 10 km Half Marathon Marathon

Oct

Durango Marathon

Durango, Colorado

5 km 13 mi 26 mi

November 2026

Nov

Rim Rock Marathon & Half Marathon

Fruita, Colorado

13 mi 26 mi

March 2027

Mar

Run Through Time Trail Marathon

Salida, Colorado

Trail Run 2 mi Half Marathon Marathon

May 2027

May