Denver's largest running weekend!
Join Denver’s largest running weekend for 2020! Choose the marathon, half marathon, or urban 10 miler and enjoy Denver’s iconic landmarks. Or create a relay team of five runners for one of the largest marathon relays in the U.S. – your team can be friends or work colleagues as we have Open, Corporate and Government divisions. Just getting started on the running scene? Try out the 5K.
Video: What You Will See
See highlights of the course before you run! Choose your distance of 26.2, 13.1, 10, 5k or split-up the marathon with a team of 5.
Denver's Only Marathon
Where to start? Boston Qualifier, through the Broncos Stadium at Mile High twice, along miles of water, through a fire station, & ranked by Runner’s World! Finish your 26.2 into a huge post-race party with live music, food, & drinks.Learn More >
A Competition of Corporate Giving - Denver Business Journal
In 2018, the Denver Business Journal named the Colfax Marathon “Denver’s corporate “it” charity of the year”. With more than $100,000 awarded to charities through the Open, Corporate, and Government Relay divisions.Learn More >
Half Marathon through Denver Zoo
Take a tour through the elephant exhibit, past the monkeys, and by the camels smiling at you on your way to 13.1 miles. Plus, firefighters from Aurora Fire will be cheering you on as you run through the firestation!Learn More >
15th Anniversary - 2 days 7 races
It is the 15th Anniversary of the Colfax Marathon and you have race distance choices! Go for the Marathon, Half Marathon, Urban 10 Miler, or grab 4 friends to make a Marathon Relay Team. Join a full week of festivities!Learn more
Get in on the Urban 10
Run the final 10 miles of the Colfax Marathon course including through Broncos Stadium at Mile High, downtown Denver, Confluence and Cherry Creek, 17th Avenue to City Park. Plus sleep in because it has later start times!Learn more
What’s better than running 26.2 miles through the Mile High City? Sharing the miles with friends! Get a team of five to run Denver’s only 26.2 mile Marathon Relay.Learn More