Event details subject to change. Please confirm all information via event website.

  • Coyote Chase 5K

    Monarch High School 329 Campus Dr, Louisville, CO, United States

    The Coyote Chase 5k is a 5k race that supports the Monarch HS XC program. The race is on the Monarch HS campus and is a 2k loop that consists […]

  • Mountain Swim Series IV

    Wellington Lake Wellington Lake Rd. Pike National Forest, Bailey, CO, United States

    Highest altitude organized marathon swim event in the country at ~8,000 feet. RACE DETAILS Distance Price* Swimmers 2.5K $110.00   Both skin/wetsuit event options 1-hour swim cutoff** 1 loop around […]

  • Gunni Hi Tri

    Gunnison Community Center 200 E Spencer Ave, Gunnison, CO, United States

    This Sprint Triathlon is proudly brought to you by the Gunnison Parks & Recreation Department. It begins with a 500yard swim (10 laps) at the Community & Aquatics Center, then […]

  • Ram Run 5K

    Green Mountain High School 13175 West Green Mountain Dr, Lakewood, CO, United States

    Come join in the celebration of the resurgence of a great community event. The Ram Run will be returning to it's traditional month. This fun and exciting event will include […]

    $30
  • Sunlight Showdown 10K

    The Sunlight Showdown
    Sunlight Mountain Resort 10901 County Road 117, Glenwood Springs, CO, United States

    Welcome to the Sunlight Mountain Race Series, where mountain air, winding trails, and a vibrant community come together for an unforgettable summer of running. For seven years, our half marathon […]

  • Warrior Waterfront 5K

    Las Colonias Park Riverside parkway, Grand Junction, CO, United States

    Come join us for the Warrior Waterfront 5k. This 5k will be run in conjunction with the Central High School Warrior Cross Country Invitational and all proceeds will go to […]

  • Boulder 5K Taco Run

    Boulder Public Library 1001 Arapahoe Ave, Bouler, CO, United States

    Super charge your Taco Crushing appetite with a run before the Boulder Taco Fest! A non-competitive fun run on some of Boulder’s most beautiful multi-use paths. There’s even an aid […]

  • Pioneer Prairie Dog Half Marathon

    Prairie Dog Race Series
    Westminster Promenade 10600 Westminster Blvd, Westminster, CO, United States

    Welcome to the Pioneer Prairie Dog Half Marathon event; the one that started the series! With 10k and 5k events too! Everyone is back to school and slipping into a […]

  • Rebel Run 5K

    Great Lawn Park 101 Yosemite St, Denver, CO, United States

    Be part of something bigger at Conservation Colorado’s second annual Rebel Run 5K — where movement meets momentum for our climate, air, land, water and communities. Last year, more than 230 […]

  • Log Hill Hustle​ 5K/10K

    Divide Ranch and Club 151 Divide Ranch Cr, Ridgway, CO, United States

    Join us for the Annual Log Hill Hustle 5K & 10K, a scenic fun run/walk hosted by Fortuna Tierra Club in support of local education. Set against the stunning backdrop […]

  • Wellington Swim-Run Challenge

    Wellington Lake Wellington Lake Rd. Pike National Forest, Bailey, CO, United States

    Swimmers may choose to swim with their shoes, paddles, a wetsuit, pull buoy, floaties, rubber duckies, inflatable flamingoes or any other nonmotorized swim aid in this event. Race Course Per […]

  • PH in the Park

    City Park - Denver 2001 Steele St, Denver, CO, United States

    2026 marks 17 years of community, awareness, and fundraising to support people with pulmonary hypertension. The University of Colorado Denver, Children’s Hospital Colorado, and the Pulmonary Hypertension Association invite you […]

  • Rock Hawk Trail Race

    Phillip S. Miller Park 1375 West Plum Creek Pkwy, Castle Rock, CO, United States

    Held on the gorgeous, thrilling and rolling trails of Castle Rock’s Miller Park & Ridgeline Trail systems. While not overly technical, these trails will challenge and excite, as you soak […]

  • Boulder Sunset Triathlon

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

    Summer may be coming to an end, but our tri season is still heating up! Join us at the Boulder Reservoir for the 13th Annual Boulder Sunset Triathlon, a local […]

  • Waneka Classic Community 5K

    Waneka Lake Park 1600 Caria Dr, Lafayette, CO, United States

    A free, timed 5K, open to the public, held prior to the Centaurus Cross Country Invitational. Proceeds from the World Famous Concessions Stand and T-shirt sales benefit the Centaurus Cross […]

  • RexRun 5K for PAWSitivity

    Arapahoe County Fairgrouds 25690 E Quincy Ave, Aurora, CO, United States

    The RexRun 5K is a 5K run/walk to spread mental health awareness and #PAWSitivity in schools with the help of more Therapy K-9's like Arapahoe County Sheriff's Office K-9 Rex. This year's event is at Dove Valley Park in Centennial on August 6th.

    $30 – $60
  • Boulder Sunset 5K/10K

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

    The Boulder Sunset 10K & 5K Run is part of BBSC’s biggest endurance event of the summer. Spend your weekend racing with BBSC at the incredible and scenic Boulder Reservoir. Register, […]

  • Thirsty 13 Half Marahton

    Ska Brewing Durango, CO, United States

    It's a race.  It's a Brewfest.  It's the Thirsty 13 Half Marathon! Are you thirsty for gorgeous scenery?  You won't find a course more beautiful than this one.  With the […]

  • Rocky Mountain 5K

    America the Beautiful Park Cimino Dr, Colorado Springs, CO, United States

    In partnership with the YMCA Pikes Peak Region, we want to bring you the annual Rocky Mountain Run, the Rocky Mountain State Games official 5k! Athletes will be looped around […]

  • Historic Main Street 5K

    Elizabeth Brewing Company 239 South Main Street, Elizabeth, CO, United States

    Join us for this family-friendly event! The 5K run/walk will begin and end on Elizabeth’s historic Main Street, featuring a new and exciting course that crosses the reconstructed trail bridge […]

  • Run Like The Wind 5K

    Downtown Allenspark 7 Washington St, Allenspark, CO, United States

    Come race in the mountain town of Allenspark Colorado.  Run the scenic 5K that circles through downtown and along dirt roads amid pine forest, boasting awe inspiring views of Mount […]

  • Summit UP Run

    Copper Mountain Resorts 184 Copper Circle, Frisco, CO, United States

    We're bringing back our Summit UP Run presented by Mammut during Union Peak Festival weekend with spectacular views to jump-start your Saturday morning before relaxing and listening to music! Choose from a […]

  • Ouray 50 Mile

    Fellin Park 1001 US-550, Ouray, CO, United States

    A 50 That's More Difficult Than Your Last 100 How do you build a 50 miler that hits harder than most 100 milers? Easy. Start with a stout mountain hundred […]

  • Bluffs 8K Trail Run

    South Suburban Race Series
    Prairie Sky Park 10249 Ridgegate Circle, Lone Tree, CO, United States

    The Bluffs 8K Trail Race has rolling hills and beautiful views as you run or walk through the Bluffs Regional Park. The race will start/finish near the Prairie Sky parking lot o n August 28th.

  • Wine Run 5K

    The Winery At Holy Cross Abbey 3011 US-50, Canon City, CO

    Join us on Sunday, August 30, 2026 for an exciting annual event that features the amazing scenery and landscape of The Winery At Holy Cross Abbey! Due to the huge […]

    $35
  • Lakewood Trail Running Series I

    Lakewood Trail Running Series
    Bear Creek Lake Park 15600 W Morrison Rd, Lakewood, CO, United States

    The popular trail running series in Bear Creek Lake Park takes place weekly in September. Different routes allow participants to explore all areas of the park. Racers can compete against […]

    $55 – $70
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