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  • Outdoor Divas Triathlon

    Union Reservoir 461 County Road 26, Longmont, CO, United States

    The Outdoor Divas Sprint Triathlon on August 21st, annually awarded best women's event in Colorado by Competitor Magazine, is the all women's triathlon you've been waiting for!  We intentionally keep the race cap low at 600 women to create a fun, festive, yet intimate racing environment.  Great goodie bags, one of our biggest expos of […]

  • Prairie Dog Race Series

    Pioneer Prairie Dog Half Marathon

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

    Get out to enjoy the crisp autumn air at the Pioneer Prairie Dog Half & 5k/10k! We will be celebrating autumn at the Start/Finish line located at the beautiful Westminster Promenade Terrace. Each participant will receive a Gender Specific Tech Tee to commemorate the day and half marathoners will receive a Finisher Medal! Stick around […]

    $35 – $80

  • Continental Divide Trail Run

    Steamboat Springs Ski Resort 2305 Mt Werner Cir, Steamboat Springs, CO, United States

    Distances: 50k (9 hour cutoff) and 16 mile (7 hour cutoff) and 5 mile (New!)

  • 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 up the amazing views. This is an excellent race for both first-time and veteran trail runners, and provides a nice test for those who are […]

  • 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 favorite. For the 5th year in a row we are the proud host of the Mountain Collegiate Conference race and the USAT Duathlon Race Series. […]

  • 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, and start training for the end-of-the-summer endurance festival with BBSC.

  • South Suburban Race Series

    Bluffs 8K Trail Run

    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.

  • Grand Traverse Mountain Run

    Mt. Crested Butte Mt. Crested Butte Ski Resort, Crested Butte, CO, United States

    The Grand Traverse Mountain Run is a point-to-point ultra marathon from Crested Butte to Aspen, Colorado. The course follows the route of the Grand Traverse Backcountry Ski race. In total, runners travel 40 miles across the Elk Mountains with over 6,000′ of elevation gain.

  • PPRR Nielson Challenge

    PPRR Nielson Challenge

    North Monument Valley Park 1794 Culebra Ave., Colorado Springs, CO, United States

    Race Format The first time you run this event, you'll establish a base time for yourself. This base time is used to generate a handicap time. The handicap time is calculated using an algorithm developed by Bob Royse, and it's geared to favor a beginning runner and the slower runners. Click here for an explanation of the […]

  • 10K (and 5K) @ 10,000 Feet

    Rabbit Ears Pass Steamboat Springs, CO, United States

    This is a challenging trail run with beautiful terrain and breathtaking scenery. The 10K race begins at 10,000 ft at the summit of Rabbit Ears Pass. The course begins by heading uphill on USFS dirt roads and 2 track, and then then heads downhill on single-track, ending on a cross country single-track. The total elevation […]

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