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  • RMRR Fall Marathon Training Series

    RMRR Marathon Training Series
    Riverwalk Ballfields 9830 Riverdale Rd, Thornton, CO, United States

    RMRR’s Marathon Training Series provides 10M and 20M races that are low cost, friendly, fully supported, and officially timed.  All you need to do is focus on your running!  Our […]

  • Bluffs 8K Trail Run

    South Suburban Race Series
    Prairie Sky Park 10249 Ridgegate Circle, Lone Tree, CO, United States

    The Bluffs 8K Trail Race has rolling hills and beautiful views as you run or walk through the Bluffs Regional Park. The race will start/finish near the Prairie Sky parking lot o n August 28th.

  • Wine Run 5K

    The Winery At Holy Cross Abbey 3011 US-50, Canon City, CO

    Join us on Sunday, August 30, 2026 for an exciting annual event that features the amazing scenery and landscape of The Winery At Holy Cross Abbey! Due to the huge […]

    $35

  • Lakewood Trail Running Series I

    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

  • Roost Rebellion Relays

    Featured
    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 […]

  • Front Range Ultra Dayze

    Centennial Park - Loveland 977 W 1st St, Loveland, CO, United States

    Welcome to Front Range Ultra Dayze! 100 hours of ultra-running madness! Our goal is to bring people from all over the U.S. together for a festival of ultra-running in Loveland, […]

  • Grand Traverse Mountain Run

    Mt. Crested Butte Mt. Crested Butte Ski Resort, Crested Butte, CO, United States

    The Grand Traverse Mountain Run is a point-to-point ultra marathon from Crested Butte to Aspen, Colorado. The course follows the route of the Grand Traverse Backcountry Ski race. In total, […]

  • Recovery Run of the Rockies 5K

    Featured
    Fossil Creek Park Lemay Avenue, Fort Collins, CO, United States

    Join us for the 4th Annual Recovery Run of the Rockies 5K on Saturday, September 5, 2026, at Fossil Creek Park in Fort Collins, Colorado! This professionally timed 5K brings […]

  • PPRR Nielson Challenge

    PPRR Nielson Challenge
    North Monument Valley Park 1794 Culebra Ave., Colorado Springs, CO, United States

    Race Format The first time you run this event, you'll establish a base time for yourself. This base time is used to generate a handicap time. The handicap time is […]

  • Golden Harvest Half Marathon

    Westminster Promenade 10600 Westminster Blvd, Westminster, CO, United States

    5k/10k/Half Marathon registration includes a custom bib, designer shirt, and a custom finisher medal! 1 Mile registration is untimed and includes a custom bib, designer shirt, and a custom finisher […]