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  • Gold Roots Trail Series

    Gold Roots Trail Series #4

    Courtney Ryley Cooper Park 2350 Colorado Blvd, Idaho Springs, CO, United States

    Run the Mighty ARGO hill this summer in a 4 race series! You will have the option of a short loop (~5 miles, ~750' gain) or a long loop (~9 […]

  • Lakewood Trail Running Series

    Lakewood Trail Running Series I

    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
  • Featured

    Roost Rebellion Relays

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

    Welcome to the Roost Rebellion Relays! Assemble your fastest 4 x 1 mile relay team to race in Washington Park. Each team needs to be co-ed with at least 2 […]

  • American Heroes Run

    Rogers Grove Park 220 North 95th Street, Longmont, CO, United States

    The tragic events of 9/11/01 changed our nation forever. Let us not forget our proud history and those who fight everyday to keep us free. Please join us for this […]

  • 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, […]

  • Mighty Marmot Kids Trail Race #1

    Maloit Park 1000 Maloit Park Rd, Minturn, CO, United States

    Come join the Vail Recreation District for the 3rd Annual Mighty Marmot Kids Trail Race Series! Youths ages 4 to 10 are welcome to participate. Chose between 1 or 2 miles* to compete […]

  • 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 […]

  • Waneka Classic Community 5K

    Waneka Lake Park 1600 Caria Dr, Lafayette, CO, United States

    A free, timed 5K, open to the public, held prior to the Centaurus Cross Country Invitational. Proceeds from the World Famous Concessions Stand and T-shirt sales benefit the Centaurus Cross […]

  • 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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