Colorado Multisport Calendar

Yeti Chase 5K & 10K

Bear Creek Lake Park (Lakewood) 15600 W. Morrison Road, Lakewood, CO, United States

The Yeti Chase 5K & 10K take place at beautiful Bear Creek Lake Park in Lakewood. This is the 13th year for the Yeti Chase, and it has sold out well before race day in all previous years. After chasing down the Yeti, runners wander the park's 2,500 acres, known for it's diverse bird and […]

Ralston Creek Half-Marathon & 5K

Arvada Arvada, CO, United States

The Ralston Creek Half-Marathon & 5K has become Colorado’s premier winter half marathon! Finisher Medals for Half Marathon finishers and a generous 4:30 cutoff time. Courses follow a scenic mix of road and bike path through Arvada's beautiful west side. Long-Sleeve Gender-Specific Tech Shirts, hot cocoa, breakfast burritos from El Senor Sol Mexican restaurant, and […]

NOCO Half Marathon & 10K

Boyd Lake State Park (Loveland) 3720 N County Road 11-C, Loveland, CO, United States

Spring is the season of renewal and running. We hope you join us for a fun adventure that embodies the spirit of springtime at the beautiful Boyd Lake State Park! Choose from the Half Marathon (13.1 mile) or 10K (6.2 mile) for your run adventure. This course is on smooth paved walkways with about three […]

Boulder Sunrise Triathlon

Boulder Reservoir 5275 Reservoir Road, Boulder, CO, United States

Kick off your summer of racing in Boulder.

Boulder Rez Marathon

Boulder Reservoir 5275 Reservoir Road, Boulder, CO, United States

This amazing run course will take you alongside the Boulder Reservoir, remaining mostly on dirt roads and trails. The course is flat with only 200 feet of gain, and will provide views of the Boulder Reservoir and Rocky Mountains. Marathon, 3/4 Marathon, Half Marathon, 10K, Relay

Boulder Sunset Triathlon

Boulder Reservoir 5275 Reservoir Road, Boulder, CO, United States

Join us for an unforgettable morning at the Boulder Reservoir. Although this race does not take place at sunset, it will take place at the end of the summer-- it's sister race is the Boulder Sunrise in June. Experience gorgeous views at the recently upgraded venue. All participants receive stellar race shirts and finisher medals, […]

Yeti Chase 5K & 10K

Bear Creek Lake Park (Lakewood) 15600 W. Morrison Road, Lakewood, CO, United States

The Yeti Chase 5K & 10K take place at beautiful Bear Creek Lake Park in Lakewood. This is the 13th year for the Yeti Chase, and it has sold out well before race day in all previous years. After chasing down the Yeti, runners wander the park's 2,500 acres, known for it's diverse bird and […]

Ralston Creek Half-Marathon & 5K

Arvada Arvada, CO, United States

The Ralston Creek Half-Marathon & 5K has become Colorado’s premier winter half marathon! Finisher Medals for Half Marathon finishers and a generous 4:30 cutoff time. Courses follow a scenic mix of road and bike path through Arvada's beautiful west side. Long-Sleeve Gender-Specific Tech Shirts, hot cocoa, breakfast burritos from El Senor Sol Mexican restaurant, and […]

NOCO Half Marathon & 10K

Boyd Lake State Park (Loveland) 3720 N County Road 11-C, Loveland, CO, United States

Spring is the season of renewal and running. We hope you join us for a fun adventure that embodies the spirit of springtime at the beautiful Boyd Lake State Park! Choose from the Half Marathon (13.1 mile) or 10K (6.2 mile) for your run adventure. This course is on smooth paved walkways with about three […]

Boulder Sunrise Triathlon

Boulder Reservoir 5275 Reservoir Road, Boulder, CO, United States

Kick off your summer of racing in Boulder.

Boulder Rez Marathon

Boulder Reservoir 5275 Reservoir Road, Boulder, CO, United States

This amazing run course will take you alongside the Boulder Reservoir, remaining mostly on dirt roads and trails. The course is flat with only 200 feet of gain, and will provide views of the Boulder Reservoir and Rocky Mountains.

Boulder Sunset Triathlon

Boulder Reservoir 5275 Reservoir Road, Boulder, CO, United States

Join us for an unforgettable morning at the Boulder Reservoir. Although this race does not take place at sunset, it will take place at the end of the summer-- it's sister race is the Boulder Sunrise in June. Experience gorgeous views at the recently upgraded venue. All participants receive stellar race shirts and finisher medals, […]

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