May 17
Date
Full Marathon, Half Marathon, 5K, Relay
Distance
180m
Elevation
22,000
Runners
Elevation Profile
Illustrative profile based on elevation data. Actual course may vary.
Course Highlights
Loop Course
Course layout type
Road Terrain
Running surface
BQ Course
Boston Qualifier eligible
Certified
USATF
About This Race
The Denver Colfax Marathon celebrates its 20th anniversary in 2026, making it the Mile High City's only marathon. Starting and finishing in City Park, the course runs through Empower Field at Mile High twice and traverses Denver's most iconic neighborhoods. The race weekend features a marathon, half marathon, Urban 10 Miler, marathon relay (the nation's largest), and a Saturday 5K Kickoff. Over 25,000 runners are expected for the anniversary celebration.
History & Records
First Edition
2006
Avg. Participants
22,000
Race Day Weather
Mid-May in Denver averages 7-22C (45-72F). Sunny but possible afternoon thunderstorms. Elevation at 5,280 feet.
Runner Reviews
Reviews are coming soon. After the race, runners will be able to share their experience here.
Organizer
Colfax Marathon
Official Website