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  • Harvest Moon Triathlon

    Boulder Reservoir 5565 N 51st St, Boulder, CO, United States

    Est. in 2000 this Colorado classic provides the veterans to beginners a challenging, affordable, and competitive race with a local flavor. Whether this is your first event of the season, […]

  • Reuter-Hess Trail Run

    Reuter Hess Incline 11865 Heirloom Pkwy, Parker, CO, United States

    10k, with 600′ of elevation gain, on the trails at the Reuter-Hess Incline and Reservoir, in Parker. After 1/3mi, you climb an incline/challenge hill. The rest of the course is […]

    $35

  • Fish Hatchery 5K

    Leadville National Fish Hatchery 2846 Hwy 300, Leadville, CO, United States

    Located at the historic Leadville National Fish Hatchery, the Fish Hatchery 5K features a scenic cross country style course that winds through subalpine forest near and around the Evergreen Lakes […]

  • Tails on the Trail 5K

    Salida Steamplant Sacket and G Streets, Salida, CO, United States

    The Tails on the Trail 5K is a family and dog-friendly 5k race with proceeds benefiting the life-saving work of Ark-Valley Humane Society. Race this with or without your dog on May 22nd at Loyal Duke's Dog Park in Salida.

  • Best Buddies Friendship Walk

    Basalt Middle School 51 School St., Basalt, CO, United States

    The Best Buddies Friendship Walk is the leading event in the country supporting inclusion for people with intellectual and developmental disabilities (IDD). Join 50,000 participants at 70+ Walks across the […]

  • Summit Trail Running Series I

    Summit Trail Running Series
    Summit County Allocation Park 639 Landfill Road, Dillon, CO, United States

    Explore the trails of Breckenridge this summer with the 23rd annual Summit Trail Running Series with each race followed by a post-race party! The Series consists of 5 trail races […]

  • The Big Run 5K

    Fleet Feet - Colorado Springs 3659 Austin Bluffs Parkway, Colorado Springs, CO, United States

    Celebrate what makes running fun — high-fives, endorphins, good friends. Come hang with Fleet Feet on Global Running Day, run a breezy 3.1 miles and make The Big Run an epic […]

  • Rocky Dog Fun Run

    GoPro Mountain Games
    Vail Village 292 E Meadow Dr, Vail, CO, United States

    Get your pup involved at the GoPro Mountain Games with this unique event! Bring your four-legged friend along for a 5K fun run/walk on Vail Mountain. Dogs and humans of all abilities […]

  • Boulder Stroke & Stride I

    Boulder Stroke & Stride
    Boulder Reservoir 5565 N 51st St, Boulder, CO, United States

    The Boulder Stroke & Stride offers Boulder area athletes a fun 1-lap 750 Meter Swim, or 2-Lap 1500 Meter swim in Boulder Reservoir, followed by a 5k run on the […]

  • First Fridays 5K

    First Fridays 5K
    Festival Park 199 Perry St., Castle Rock, CO, United States

    Friday nights in the summer are made for spending time close to home, enjoying the beautiful weather, and unwinding from the long week. Why go anywhere else but Downtown Castle […]

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