20,000 Runners Run in Denver's largest race!
Join Denver’s largest running weekend for 2019! 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 where we have waves for runners and walkers.
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 >
Urban 10 Miler - A favorite!
Run the final 10 miles of the Colfax Marathon course! An epic run-through Broncos Stadium at Mile High, downtown Denver, Confluence and Cherry Creek, 17th Avenue to City Park – and one big afterparty. Sleep in, because you get a later start time – and it’s a staggered start from Rocky Mountain College of Arts and Design (RMCAD).Learn more
Share the 26.2 miles! Get a team of five to run Denver’s only 26.2 mile Marathon Relay. Choose: Open, Corporate Relay (employee teams), and Government Relay (employee teams). See the great sites of the Mile High City on each leg – from Broncos Stadium at Mile High to the Confluence, Sloan’s Lake, downtown, or the neighborhoods around Colfax – which one will you run?Learn more
$100,000 Awarded to Charity - and More!
The annual Marathon Awards Evening was held in June! This celebratory evening invites winners, winning relay teams, and nonprofit recipients. Winners receive trophies, and a “big check” for their designated charity. In total, there were 60 winning awards across the relay divisions (such as corporate overall, healthcare, construction, finance, public school teachers, and open). Colfax Marathon awarded over $100,000 to charities via these winners. Check out the relay winners and recipients – Corporate, Government, and Open.