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  • Erie Half & 5K

    Reliance Park 900 Weld County Road 1.5, Erie, CO, United States

    Join us for the Erie Half and 5k! The Hometown Race Series features half marathons and 5k distance events in outlying communities outside the Denver and Boulder metro areas. LOOK […]

  • Outdoor Divas Triathlon

    Union Reservoir 461 County Road 26, Longmont, CO, United States

    The Outdoor Divas Sprint Triathlon on August 21st, annually awarded best women's event in Colorado by Competitor Magazine, is the all women's triathlon you've been waiting for!  We intentionally keep […]

  • Race for Research 5K

    Washington Park - Denver 701 S Franklin St, Denver, CO, United States

    HOW THE RACE 4 RESEARCH STARTED Michele Plachy-Rubin was a young wife,  mother, and kindergarten teacher in the Denver Public Schools when she was diagnosed with brain cancer in December […]

  • Leadville Trail 10K

    Leadville Race Series
    Leadville 124 E. Sixth Street, Leadville, CO, United States

    This out-and-back course uses the first and last 3.1 miles of the LT100 Run course, featuring paved and dirt roads. Held the weekend of the historic Leadville Trail 100 MTB, […]

  • Staunton Rocks! Trail Marathon

    Staunton State Park 12102 S Elk Creek Rd, Pine, CO, United States

    Welcome to the Staunton Rocks! Marathon & Half Marathon, an event put on by trail runners for trail runners on August 28, 2021. Touring the renowned singletrack of Staunton State Park in Colorado’s Front Range Mountains southwest of Denver, the race will take you back in time as you glide by historic buildings and old milling operations.

    $90 – $130

  • Bergen Peak Half Marathon

    Evergreen Trail Race Series
    Buchanan Park Recreation Center 32003 Ellingwood Trail, Evergreen, CO, United States

    Come run with us in beautiful Evergreen to the top of Bergen Peak at gorgeous Elk Meadow Park! This race day will offer both a 5k and a half marathon […]

  • Byers Peak Stampede

    Winter Park Peak to Peak Summer Showdown
    High Country Stampede Rodeo 1741 Co Hwy 73, Winter Park, CO, United States

    The race is hosted by Shining Stars Foundation, a nonprofit providing recreational and social programs for children and families affected by pediatric cancer. All proceeds support the kids. There is […]

    $5 – $70

  • Arrowhead Half Marathon

    Featured Vail Trail Running Series
    Arrowhead at Beaver Creek 160 Cresta Rd, Edwards, CO, United States

    The Vail Recreation District is excited to announce a NEW venue for one of our favorite events in the 2021 Dynafit Vail Trail Running Series - The Dynafit Half Marathon and 5K at Arrowhead in Beaver Creek on August 21st.

  • Mountain Swim Series IV

    Wellington Lake Wellington Lake Rd. Pike National Forest, Bailey, CO, United States

    Highest altitude organized marathon swim event in the country at ~8,000 feet. RACE DETAILS Distance Price* Swimmers 2.5K $110.00   Both skin/wetsuit event options 1-hour swim cutoff** 1 loop around […]

  • Gunni Hi Tri

    Gunnison Community Center 200 E Spencer Ave, Gunnison, CO, United States

    This Sprint Triathlon is proudly brought to you by the Gunnison Parks & Recreation Department. It begins with a 500yard swim (10 laps) at the Community & Aquatics Center, then […]

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