LARGEST MARATHON WEEKEND IN THE ROCKY MOUNTAIN REGION
Registration now open!
We are excited to host the largest marathon weekend in The Rockies on May 15-16, 2027! All the choices for all the goals:
- Denver’s only Marathon through Empower Field at Mile High Stadium
- Half Marathon running through Denver Zoo Conservation Alliance
- Assemble a team of 5 for the Marathon Relay
- Take on the last 10 miles of the Marathon in the Urban 10 Miler
Finish in City Park with a huge running festival to collect your unique medal! Registration also includes race photos, shirt, lunch, drinks, huge expo at the stadium, and more!
Denver Colfax Marathon Weekend Details
5K on the Runway at Denver International Airport - September 12, 2026
Run down the Runway at Denver International Airport, one of top 10 busiest airports in the world! Only one other time has DEN shut down a runway for this 5K on the Runway. Join us for this rare opportunity for you to pilot yourself down a runway. Sold out in 5 hours!
Unique airplane finisher medal, race shirt, hot breakfast, coffee, parking, and DJ party before and after!
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Denver's Only Marathon
Where to start? Boston Qualifier, through Empower Field 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.
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Half Marathon Course - Downtown & a Denver Zoo Mile
The animals at Denver Zoo will be your spectators for a full mile of this great half marathon course. Elephants, giraffes, zebras, monkeys, and many more will be watching your “personal safari” for a full mile. You’ll have one mile in Denver Zoo, plus you’ll run along Colfax with epic spots like VooDoo Donuts, by the Capitol, inside Denver Fire Station #1, and along 17th Avenue into an awesome finish party with 25,000 new friends!
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Marathon Relay - Open, Corporate, Gov't, Public School Teachers
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. Most teams run for fun. Others run for bragging rights and money for charity.
It’s the largest in the US – because of the fun! Companies and government entities enter multiple teams in their industry division – like Construction, Healthcare, or Public School Teachers. Friends enter the Open Division.
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A Competition of Corporate Giving
Denver Business Journal named in a recent year the Colfax Marathon “Denver’s corporate “it” charity of the year”, with an average of $150,000 awarded annually to charities through the Open, Corporate, and Government Relay divisions. Get your company teams together now!
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Urban 10 Miler - a local's favorite
It’s the marathon course in just 10 miles! Perfect if you love the idea of running downtown, through the stadium, eclectic college campus, and waterways – but do not want to tackle a full 26.2 miles. It’s a point to point race, that starts a bit later at RMCAD, and then finishes with the marathon, half, and relay in City Park. Your bib has an RTD ticket to get back to your car. A Denver favorite!
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