Barr Lake Trail Race

Barr Lake State Park 13401 Piccadilly Road, Brighton, CO, United States

The Barr Lake Trail Race returns to Brighton, CO, offering beautiful lake views and a prime opportunity for new PRs. Now in its sixth year, this event features our flattest […]

Ironman 70.3

Boulder Reservoir 5565 N 51st St, Boulder, CO, United States

Boulder has been a household name in the world of triathlon for decades. This endurance community has built a reputation among triathletes for training hard, racing fast and enjoying every […]

Father’s Day Classic

Apex Center 13150 W 72nd Ave, Arvada, CO, United States

It's an annual Fathers Day tradition in Arvada! All are welcome - walkers, joggers and speed demons, too! Swag includes t-shirts for ALL participants! There is a 5K and 10K. […]

Unicorn 5K

Carpenter Park 3498 E 112th Ave, Thornton, CO, United States

Ready to get off the sofa and gallop around Thornton with some friends?  Yeah, you are!  Come frolic with us at the Unicorn Runner 5k in Thornton to kick off […]

Estes Park Backyard Ultra

Estes Park High School 1600 Manford Ave, Estes Park, CO, United States

The Backyard Ultra with the views. ​ The Backyard Ultra is a form of Ultra race where runners must complete 4.167 miles in less than one hour, every hour, until only one […]

Boulder Sunrise Triathlon

Boulder Reservoir 5565 N 51st St, Boulder, CO, United States

Join us in celebrating the start of summer in the triathlon capital of the country, Boulder, CO. An athlete favorite with its breath-taking sunrise swim, fast bike and smooth run […]

Boulder Sunrise 5K/10K

Boulder Reservoir 5565 N 51st St, Boulder, CO, United States

The Boulder Sunrise 10k & 5k Run has a reputation of being one of the most scenic courses around. BBSC will provide runners with a supported course, including plenty of […]

PPRR Nielson Challenge

North Monument Valley Park 1794 Culebra Ave., Colorado Springs, CO, United States

Race Format The first time you run this event, you'll establish a base time for yourself. This base time is used to generate a handicap time. The handicap time is […]

PPRR Nielson Challenge

North Monument Valley Park 1794 Culebra Ave., Colorado Springs, CO, United States

Race Format The first time you run this event, you'll establish a base time for yourself. This base time is used to generate a handicap time. The handicap time is […]

Please click here to submit your event for FREE to our online calendar.
We do not allow events without physical locations (IE – virtual runs, runs with locations TBD, etc…).
Please allow 48 hours after submission for an event to appear on the calendar. If you have already listed your event and would like us to update it, please contact us.