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  • Greenland Trail Race

    Featured
    Greenland Open Space 1532 E Noe Rd, Larkspur, CO, United States

    The Greenland Trail Race offers 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 Pikes Peak as your backdrop, you’ll cruise over a soft dirt trail on your way to a new personal best. With chip timing, an innovative technical running shirt in men’s and women’s sizing, food and beer at the finish, this race will make you want to come back for more!

  • Foster Care 5K

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

    Adams County will host its annual 5K race, and 1 mile fun run at the Riverdale Regional Park which is home to the Adams County Fair.  Registration opens at 6:45 […]

  • Collegiate Peaks Trial Run

    Buena Vista Community Center 715 E Main St, Buena Vista, CO, United States

    The Collegiate Peaks Trail Run takes place in Buena Vista, Colorado and offers two race distance options - 25 miles and 50 miles. The race was established in 1991 and […]

  • runBlossom 5K

    Centennial Park - Cañon City Cañon City, CO, United States

    Event Information: For 20 years, the annual runBlossom race has helped usher in the summer season in Cañon City. As the snow melts and the leaves begin to adorn trees, […]

  • Duck Waddle 5K

    Lake Estes Marina 1770 Big Thompson Drive, Estes Park, CO, United States

    Our Vision: Experiencing physical activity with a group encourages motivation, emotional wellbeing, accountability, fun and friendships. By providing athletic events we hope to inspire youth, families and individuals to enjoy […]

    $30 – $40

  • Hope House 5K

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

    Our 13 annual Hope House 5K & Fun Run will take place on Saturday, May 2, 2026 at the Promenade Terrace Park (South of the Westin Westminster)! It will be a fun-filled […]

  • Walk MS

    Walk MS
    City Park - Denver 1700 N York St, Denver, CO, United States

    Walk MS includes a powerful new experience where you’ll witness how your support changes the lives of people with MS and gets us closer to our ultimate goal: a cure. […]

  • Colorado Marathon

    Featured
    Washington Park - Fort Collins 301 Maple St, Fort Collins, CO, United States

    Marathon, Half Marathon, 10k, 5k and 3-Person Marathon Relay.  Marathon, Marathon Relay and Half Marathon runners get to run down the scenic, downhill Poudre Canyon to the finish in Old […]

  • Longmont Half and 5K

    Longmont Rec Center 310 Quail Rd., Longmont, CO, United States

    Longmont's only Half Marathon - now offered in the cooler month of MAY! Join the Half Marathon or 5k distance! Walkers and Runners of all abilities welcome!

  • Moose Mudder

    Altitude Elementary School 27300 East Southshore Drive, Aurora, CO, United States

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

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