Marathon races in Colorado, United States — 2026 running calendar

Mar

13

22nd Annual Run Through Time Trail Marathon and Half Marathon

Salida, Colorado, United States

Trail running Running

Marathon Half-Marathon 3.2K

May

02

The Colorado Marathon

Fort Collins, Colorado, United States

Running

Marathon Half-Marathon 5K 10K

Jun

05

Weld Your Mettle Running Festival

Eaton, Colorado, United States

$35.00 - $210.00

Trail running Running

Ultra 6.9K 22.5K Marathon +9

Jun

06

The Steamboat Marathon

Steamboat Springs, Colorado, United States

$70.00 - $125.00

Running

Marathon Half-Marathon 10K

Aug

01

Bound for Boston Marathon & Half Marathon - Denver

Denver, Colorado, United States

Free - $75.00

Running

Marathon Half-Marathon Cheer Crew +1

Oct

11

Durango Marathon

Durango, Colorado, United States

Running

Marathon Half-Marathon 5K

Oct

10

Breckenridge RunFest

Breckenridge, Colorado, United States

Running

10K 5K 1.6K Marathon +1

Oct

10

The Long View Marathon

Fort Collins, Colorado, United States

Running

Marathon Half-Marathon 5K

Oct

04

Windsor Marathon, Half Marathon, 10k, 5k & 1 Mile Run

Windsor, Colorado, United States

Running

Marathon Half-Marathon 10K 5K +1

Oct

03

Colorado Springs Marathon, Half, 5K, and Kids K

Colorado Springs, Colorado, United States

Running

Marathon Half-Marathon 5K 1K +11

Sep

27

Girls on the Run Rockies Boulderthon SoleMates

Boulder, Colorado, United States

Running

Marathon Half-Marathon 10K

Sep

20

Pikes Peak Marathon

Manitou Springs, Colorado, United States

Running

Marathon