Colorado Multisport Calendar

  • Boulder Sunrise Triathlon

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

    Kick off your summer of racing in Boulder.

  • Tri Boulder

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

    As one of Colorado’s most popular summer triathlons, Tri Boulder offers many different multisport race distances, all in one eventful day! Join us for a full day of racing at the Rez.

  • Tri Boulder

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

    Rocky Mountain Tri-Fest was established in 2023 to cater to the whole family. With events for everyone from mom and dad looking to try their hand at a gravel triathlon, to children looking to do their first triathlon. The Sprint and Super Sprint gravel Tris are beginner friendly with the bike course on the gravel […]

  • 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.

XTERRA Wetsuits