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  • Denver Broncos Fit 7K

    Empower Field at Mile High 1701 Bryant St., Denver, CO, United States

    All members of Broncos Country, walkers and runners alike, are invited to join the Denver Broncos for the 13th annual Broncos 7K presented by CommonSpirit, Ticketmaster, King Soopers, and Cigna […]

  • 10K (and 5K) @ 10,000 Feet

    Steamboat Springs Running Series
    Rabbit Ears Pass Steamboat Springs, CO, United States

    This is a challenging trail run with beautiful terrain and breathtaking scenery. The 10K race begins at 10,000 ft at the summit of Rabbit Ears Pass. The course begins by […]

  • Labor Day Half Marathon

    Featured
    Salisbury Park 11920 N Motsenbocker Rd, Parker, CO, United States

    Celebrate the last blast of summer at the Labor Day Half Marathon. Sweat your socks off and let summer have its last hooray at Parker's Salisbury Park just a few miles southeast of Denver. There's a distance to meet every taste with a half marathon 10K and 5K.

  • Lakewood Trail Running Series II

    Lakewood Trail Running Series
    Bear Creek Lake Park 15600 W Morrison Rd, Lakewood, CO, United States

    The popular trail running series in Bear Creek Lake Park takes place weekly in September. Different routes allow participants to explore all areas of the park. Racers can compete against […]

    $55 – $70

  • Flaming Foliage Relay

    Citizens Park 17th Ave & Miner St, Idaho Springs, CO, United States

    Flaming Foliage is a 165 mile overnight team relay race adventure with single track trails, from Idaho Springs to beautiful Buena Vista, over Guanella, Georgia & Fremont Passes. Since 2013, […]

  • Snow Mountain Ranch Trail Festival

    YMCA of the Rockies - Snow Mountain Ranch 1101 County Rd #53, Granby, CO, United States

    Join us at the YMCA of the Rockies in Granby for the annual Snow Mountain Ranch Trail Running Festival. This event features 4 races with 2 different "challenges".  Races will […]

  • Littlefoot Sprint Triathlon

    Bear Creek Lake Park 15600 W Morrison Rd, Lakewood, CO, United States

    Enjoy a fun late season tri at beautiful Bear Creek Lake Park in a land before time. Set at the base of the foothills, the Littlefoot Triathlon starts off with […]

  • Black Squirrel Half Marathon

    Lory State Park 708 Lodgepole Dr, Bellvue, CO, United States

    The Black Squirrel Trail Half Marathon takes place on the wonderful trails of Lory State Park to the northwest of Fort Collins, CO. The trail half marathon course offers a […]

    $90 – $125

  • Devil on the Divide 50K/22K

    Minton Park Cemetery Rd, Empire, CO, United States

    We are pleased to present one of the most beautiful and challenging trail racing events in the state of Colorado with breathtaking (literally and figuratively) views of Clear Creek County […]

  • Lake Nighthorse Triathlon

    Lake Nighthorse 1795 CR 210, Durango, CO, United States

    Scenic and hilly Sprint and Olympic(standard) distance triathlons held at Lake Nighthorse Recreation Area in Durango 9/6/25 with prize money for top 3 overall male and female racers.

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