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  • Greenland Trail Races

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    The Greenland Trail Races offer four outstanding distances in southern Douglas County. Run the 4 Miler, the 8 Miler, the 25K, or tackle the 50K ultramarathon, Colorado’s fastest 50K! With …

  • Colorado Marathon

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    The Colorado Marathon is an annual race held in the verdant Poudre Canyon, nestled in the picturesque Rocky Mountains, just outside of the beautiful city of Fort Collins. Registration for …

  • Moose Mudder 5K

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    Altitude Elementary School 27300 E Southshore Dr, Aurora, CO, United States

    Please join us for the 2026 Moose Mudder 5K! This is a community event that will consist of an untimed 1k fun walk/run and a timed 5k followed by an …

  • Five Star 5K Fun Run and Wellness Festival

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    Riverdale Regional Park 9755 Henderson Road, Brighton, CO, United States

    Adams 12 Five Star Schools is invested in the Whole School, Whole Community, Whole Child (WSCC) approach to education and is committed to ensuring that all students are safe, supported, …

  • Mother’s Day Run

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    Louisville Community Park 955 Bella Vista Dr, Louisville, CO, United States

    The Louisville Trails near old town host the Mothers Day Run in 2026.  This run is all about Fun, Music, Gifts and sharing time with the family! For complete information, …

  • Highlands Ranch Mothers Day 5k

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    Cresthill Middle School 9195 Cresthill Ln, Highlands Ranch, CO

    The HRCA Mother's Day 5K is a family-friendly race taking place on Saturday, May 10, 2026.  This course is suitable for participants of all levels, whether they are first-time 5K …

  • Cherry Creek Race for the Watershed

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    Cherry Creek Reservoir

    Join us for a fun-filled day of running, walking, and most of all, supporting the Cherry Creek Watershed! Lace up your shoes and get ready to hit the trail with …

  • Colfax Marathon Weekend

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    The biggest running weekend of the year kicks off on Saturday May 16th with the Colfax 5K at City Park.  Stick around to catch the Girls on the Run 5K …

  • Mile High Mile

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    Boulder High School 1604 Arapahoe Ave, Boulder, CO

    The Mile High Mile is back for its 8th season—bringing together Boulder’s running community for an unforgettable night at the track. From first-time runners and youth athletes to competitive racers and elite …

  • Bolder Boulder 10K

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    Boulder Boulder, CO

    Join Colorado’s biggest and boldest Memorial Day tradition.