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  • 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, […]

  • Pancake Stampede 5K

    South Suburban Race Series
    Hudson Gardens and Event Center 6115 S Santa Fe Dr, Littleton, CO, United States

    Work up an appetite for a deluxe breakfast at The Pancake Stampede 5K on August 15th! The race is a part of Littleton's Western Welcome Week celebration and held before the annual pancake breakfast at Geneva Park. The 5K takes place at Hudson Gardens.

  • 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, […]

  • Canceled Gold Roots Trail Series #3

    Gold Roots Trail Series
    Courtney Ryley Cooper Park 2350 Colorado Blvd, Idaho Springs, CO, United States

    Run the Mighty ARGO hill this summer in a 4 race series! You will have the option of a short loop (~5 miles, ~750' gain) or a long loop (~9 […]

  • Summit Trail Running Series V

    Summit Trail Running Series
    Carter Park 500 South High Street, Breckenridge, 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 […]

  • 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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