Colorado Multisport Calendar

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 […]

Dash & Dine 5K

The Dash & Dine 5k run, Boulder's favorite spring tune-up run series at the beautiful Boulder Reservoir in Boulder, CO.

Dash & Dine 5K

The Dash & Dine 5k run, Boulder's favorite spring tune-up run series at the beautiful Boulder Reservoir in Boulder, CO.

Dash & Dine 5K

The Dash & Dine 5k run, Boulder's favorite spring tune-up run series at the beautiful Boulder Reservoir in Boulder, CO.

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! […]

Dash & Dine 5K

The Dash & Dine 5k run, Boulder's favorite spring tune-up run series at the beautiful Boulder Reservoir in Boulder, CO.

Boulder Sunrise Triathlon

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

Kick off your summer of racing in Boulder.

Timberview Trail Run

Lory State Park (Fort Collins) 708 Lodgepole Drive, Bellvue, CO, United States

Crisp morning air and a summer sunrise in Colorado. YES PLEASE! Join us on the foothills at Lory State Park for a fun & beautiful morning trail race. This run […]

Frisco Triathlon

Frisco Bay Marina 267 Marina Road, Frisco, CO, United States

Are you looking for a new challenge this summer? Register for the 8th Annual Frisco Triathlon featuring stand-up-paddle boarding, mountain biking, and trail running. This twist on a triathlon is […]

Donor Dash 5K

Washington Park, Denver S. Downing St. and E. Louisiana Ave., Denver, CO, United States

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 […]

Boulder Peak Triathlon logo