15th Anniversary is in


October 16-17, come to the Mile High City and celebrate the 15th running of Denver Colfax Marathon!   This is the largest running weekend in the Rockies that includes a Marathon, Half Marathon, Urban 10 Miler, Marathon Relay and day before 5K.

Leading up to the big running weekend, enjoy our other events.   This starts in May with the Runner’s Reunion 5K and 10K, followed by Mile High Women’s 10K in August, and then in September we say with our feet Goodbye Summer 5k.

Join one of the country’s largest running communities all year long!

COLFAX MARATHON RESCHEDULE:  Due to the impact of COVID, the Colfax Marathon is scheduled October 16-17, 2021.  Race Weekend details will be finalized after the Broncos schedule is announced in May. (For example, a Sunday home game may mean the main race day will be on Saturday, not Sunday. The 5K would then change to Sunday).  The Colfax Marathon will return to its historical May dates in 2022.    If you chose to defer to 2021, you will be emailed a personalized code (non-transferrable) to register for 2021 mid spring.  If your plans have changed, you will be able to choose to defer to 2022 at that time.  Registration will open mid to late spring 2021 for new and deferred registrants.

Check out the video of the Denver Colfax Marathon weekend!

Denver Colfax Marathon Weekend Details