Colorado Multisport Calendar

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  • The Blue Sky Ascent

    Idaho Springs Idaho Springs, United States

    Although the air will be noticeably thin at the starting line, Echo Lake's 10,600 feet of elevation is just the beginning. The climb totals nearly 4,000 vertical feet - much […]

  • Vail Nordic Town Series Race

    Maloit Park in Minturn Minturn, United States

    The Vail Nordic Town Series Races are put on by the Ski & Snowboard Club Vail. Skiers of all ages and abilities are welcome to attend! Day-of, on-site registration | […]

  • hilly Cheeks Duathlon Series logo

    Chilly Cheeks Duathlon Series

    Hobie Park 4800 S. Dayton St., Greenwood Village, CO, United States

    Denver's low key, low cost multisport winter series!!! The Chilly Cheeks Winter Series is composed of three fun run-bike events at the Cherry Creek Reservoir. We provide a marked and […]

  • Aspen Snowmass

    Audi Power of Four Ski Mountaineering

    Aspen Snowmass Aspen-Snowmass, CO, United States

    The Audi Power of Four Race Series is a premier endurance race series utilizing the unique and amazing terrain of each of the four Aspen Snowmass mountains. Each race is […]

  • Granby Ranch Skate Race, GCNRS #6

    Granby Ranch 1000 Village Rd, Granby, United States

    Venue: Nordic trails at Granby Ranch Golf Course. Race headquarters will be at the golf club house. Event: Skate, Long Course 15km, Short Course 7.5km, Junior 3k. Course: The 15km […]

  • Snow Mountain Stampede Skate Races, GCNRS #7

    Snow Mountain Ranch 1101 Co Rd 53, Granby, CO, United States

    Venue: Snow Mountain Ranch Nordic trails. Race HQ will be at the Camper’s Hub building. Event: Skate, Long Course 50km, Short Course 25km, 12.5km (not series eligible), Junior 3km. Course: […]

  • Snow Mountain Stampede Classic Races, GCNRS #8

    Snow Mountain Ranch 1101 Co Rd 53, Granby, CO, United States

    Venue: Snow Mountain Ranch Nordic trails. Race HQ will based out of the Camper’s Hub building. Event: Classic, Long Course 50km, Short Course 25km, 12.5km (not series eligible), Junior 3km. […]

  • Vail Nordic Town Series Race

    Maloit Park in Minturn Minturn, United States

    The Vail Nordic Town Series Races are put on by the Ski & Snowboard Club Vail. Skiers of all ages and abilities are welcome to attend! Day-of, on-site registration | […]

  • Three Creeks Half Marathon

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

    Racing Underground brings you an amazing half marathon this spring! The Three Creeks Half Marathon features a half marathon course that is flat, fast and scenic! Travel on foot through […]

  • BBSC Endurance Sports

    Boulder Rez Half

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

    This spring race features a spectator-friendly Half Marathon, 10K and 5K course. Attracting athletes from all over the west due to its phenomenal scenery, glamorous finisher medals, perfect running temperatures […]

  • NOCO Half Marathon & 10K

    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! […]

  • BBSC Endurance Sports

    Harvest Moon Long Course Triathlon

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

    The Harvest Moon Half Distance Triathlon: This event takes place at the beautiful Boulder Reservoir on May 31st, 2026 and we couldn't be more excited to be back for another […]

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