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  • St Vrain for the Brain 5K

    Niwot High School 8989 Niwot Road, Niwot, CO, United States

    Run or walk this charity 5k in which all proceeds benefit brain cancer research! There will be trophies for the top finishers in men, women, and youth. Costumes are encouraged […]

  • Sarcoma Strong 5K

    Sloan's Lake Park 1700 Utica Street, Denver, CO, United States

    Hi all! Please join us at Sloan's Lake Park in Denver on 8/8 for a 5K to raise awareness for cancer! Specifically, sarcomas, a group of cancers that affect tissues […]

  • Eat. Run. Adopt. 10K

    Trailhead Cafe 375 Meadowlark Dr, Berthoud, CO, United States

    Join us for Berthoud’s first-ever community-driven 10k! In partnership with Berthoud Pet Supply, this isn’t just a race—it’s a moving feast with a mission. A portion of race registration proceeds […]

  • Summer Sizzler 5K

    Norris Penrose Event Center 1045 Lower Gold Camp Rd, Colorado Springs, CO, United States

    Join us for the annual Summer Sizzler!  Whether you are looking to run, walk or just enjoy the race SWAG this race is a sure thing for a great time […]

  • Rocky Mountain Tri-Fest

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

    Rocky Mountain Tri-Fest is Colorado's newest Multisport event, catering to the whole family. With events for everyone from mom and dad looking to try their hand at a gravel triathlon, […]

  • Bullfrog Summer Surge

    Addenbrooke Park 600 S. Kipling Parkway, Lakewood, CO, United States

    The Bullfrog Summer Surge is a community first race morning built around movement, connection, and summer fun. Set at Addenbrooke Park, there's something for every pace: a timed 5K for […]

  • Berkeley Circuit

    Berkeley Park 4601 W 46th Ave, Denver, CO, United States

    Event Description Berkeley Circuit Race Schedule: 8:30- Free and Fun Kids Quarter Mile (no registration necessary, just show up to race!)  8:45- Community One Mile Run (all paces welcome- walkers, […]

  • San Juan Softie 100

    Durango Nordic Center 49786 Hwy 550 N, Durango, CO, United States

    The softest 100 miler in the San Juans This 100 mile ultra marathon starts and finishes just north of Durango, Colorado. The race will take you through some of the […]

  • Roxborough Ultras

    Roxborough State Park 6323 Roxborough Dr, Littleton, CO, United States

    Roxborough Ultras is a late-summer trail ultramarathon in Roxborough State Park, Colorado, offering a 50K and 50M on fully marked, all-trail courses. Both distances feature sustained climbing, technical sections, exposed […]

  • Westminster Trail Race

    Endurance Race Series
    Wayne Carle Middle School 10020 100th Ave, Westminster, CO, United States

    After a special night edition last year, Westminster returns to its traditional daytime format in 2026 — bringing runners back to a classic morning on the trails at Standley Lake.Now […]

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