Cirque Series 14K

Arapahoe Basin Ski Resort 28194 US-6, Keystone, CO, United States

The race begins at 10,780' ft, starting at the base of Arapahoe Basin, Mountain Goat Plaza, head up to the High Noon parking lot, then to last chance.  You will cross highway 6, get on the A-Basin summer road.  You will follow the summer road up to Black Mountain Lodge.  From Black Mountain Lodge you […]

Horsetooth Open Water Swim

Horsetooth Reservoir 4200 W County Road 38 E, Fort Collins, CO, United States

Swim a 10K, 2.4 miles, 1.2 miles, 1000 meters, or 250 meters in the Horsetooth Reservoir.  The Horsetooth Open Water Swims incorporated as an independent 501(c)3 not-for-profit organization.  Our current beneficiary is Partners Mentoring Youth.

RMRR Fall Marathon Training Series

Riverwalk Ballfields 9830 Riverdale Rd, Thornton, CO, United States

RMRR’s Marathon Training Series provides 10M and 20M races that are low cost, friendly, fully supported, and officially timed.  All you need to do is focus on your running!  Our races fit perfectly in training schedules for Colfax, Boston, New York, Chicago, and other full and half marathons. Everyone is welcome at our MTS races:  RMRR members, […]

Tri the Rock Kids Tri

Butterfield Park 3952 Butterfield Crossing Drive, Castle Rock, CO, United States

We welcome you to our 17th annual youth triathlon! Tri the Rock is designed for, and open to youth ages 5 to 18. Come for a great day of fun, food, prizes and sport! Age division participants for Tri the Rock compete based on age on RACE DAY. Be sure to register and prepare accordingly. Race […]

Event Series RMRR Trophy Series

RMRR 5K/10K

Riverwalk Ballfields 9830 Riverdale Rd, Thornton, CO, United States

Everyone – slow, fast, or in-between –  can win  at RMRR Trophy Series races.  With our handicap scoring system, we predict YOUR finish time based on recent running results, giving you a great goal to shoot for whatever your speed.  Just show up an hour before the start and we’ll get you ready for your race.  It’s an […]

Denver Rocks Run 5K/10K

City Park - Denver 1700 N York St, Denver, CO, United States

We all know Denver is known for its world-class cultural attractions, thriving craft breweries, and red-hot music scene. Be part of the first 5K/10K running event of its kind with this rock n' roll infused run that kicks off at Civic Center Park in downtown Denver on November 6, 2021.

$45

9/11 Heroes Run

Great Lawn Park 101 Yosemite St, Denver, CO, United States

The 9/11 Heroes Run is a 5k race honoring our heroes: those lost on September 11th and in the wars since, as well as the veterans, active duty, first responders, inspired civilians and families of the fallen that support them. This race benefits the Travis Manion Foundation which empowers veterans and families of fallen heroes […]

Honey Bee Hustle

Fairgrounds Park 700 S Railroad Ave, Loveland, CO, United States

Are you ready to challenge yourself? We will have a 1-mile loop open for 1 ½ hrs. Who can run the most loops in 1 ½ hrs? Who can run the fastest? We will have awards for different categories. Come challenge yourself at the Honey Festival while running the Honey Bee Challenge! There will be […]

Lakewood Trail Running Series II

Bear Creek Lake Park 15600 W Morrison Rd, Lakewood, CO, United States

The popular trail running series in Bear Creek Lake Park takes place weekly in September. Different routes allow participants to explore all areas of the park. Racers can compete against others in-person on Wednesday evenings, or run the marked course on their own Tuesday-Thursday weekly for a virtual option.

$55 – $70

Arapahoe County 5K Trail Run

17 Mile Horse Farm Park 8181 S. Parker Rd, Centennial, CO, United States

Lace up your sneaks for a timed 5K race beginning at Tagawa Gardens and running along the Cherry Creek Regional Trail. Walkers and all ages welcome! Funds support trail maintenance and Arapahoe County Open Spaces. BBQ and live bluegrass at the finish line!  

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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.