Running events and triathlons in Colorado: an overview of all runs and triathlon competitions in Colorado.
Information on all races in Colorado, including dates, registration, course, schedules and results.
Colorado Running: Altitude Challenges and Rocky Mountain Views
Running in Colorado is synonymous with high altitude, stunning scenery, and serious climbing, making it the ultimate training ground for runners seeking a challenge. While Denver hosts numerous large races, the most spectacular endurance challenges happen in the mountains. The state’s premier destination marathon is often considered the Leadville Trail Marathon, which trades the city asphalt for rugged mountain paths. Held entirely at extreme altitude, this race tests runners with steep climbs and technical terrain in a breathtaking setting.
The Flat, Fast Urban Alternative: Denver
For those who prefer a city course, the Colfax Marathon in Denver is one of the nation's largest marathons and half marathons. The race is known for its unique route, including a lap through the Denver Zoo and running past some of the city's key landmarks. Although Denver is at a higher elevation than most major cities, the course itself is relatively flat, making it a popular choice for runners who want to experience the Mile High City’s running culture without tackling aggressive mountain vertical gain.
The Colorado running scene is truly defined by its trail races. Events like the Pikes Peak Ascent and Marathon are legendary, subjecting runners to massive elevation changes that showcase the state's extreme terrain. Whether you choose the altitude challenge of the Rockies or the urban hustle of Denver, preparation for high elevation is key to success in the Centennial State.
To the overview of all events in our race calendar:
All Races 2026 in Colorado
Desert Rats Trail Running Festival
 | 11.04.2026 ✔ |
| |
 | Fruita |
 | 100 km (1.109 Hm) / 50 km (1.109 Hm) / 21 km / 10 km |
The Sangre de Cristo Ultras
| 26.09.2026 ✔ |
| |
| Westcliffe |
| 322 km / 161 km / 100 km / 80,5 km / 50 km / 27 km |
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