Colorado Marathon Races

Upcoming marathon races in Colorado, sorted by date.

Mar 2027

22nd Annual Run Through Time Trail Marathon and Half Marathon

Salida, CO · from $15

A coach turns a goal time into a plan built around your schedule, your history and your race, and can meet you in Colorado.

The Colorado Marathon

Fort Collins, CO · from $50

Weld Your Mettle Running Festival

Eaton, CO · Virtual option · from $45

Steamboat Marathon

Steamboat Springs, CO · from $65

Bound for Boston Marathon & Half Marathon - Denver

Denver, CO · Virtual option

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

Colorado Springs, CO · Virtual option · from $12

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

Windsor, CO · from $25

Pace calculator →

Pace, finish time, race predictions and training paces.

Mile-by-mile pace band →

Printable splits with negative-split and hill adjustments.

Race listings come from RunSignup. Dates, prices and details can change, so confirm on the race's registration page.