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  • Ralston Creek Half Marathon logo

    Ralston Creek Half-Marathon & 5K

    Arvada Arvada, CO, United States

    The Ralston Creek Half-Marathon & 5K has become Colorado’s premier winter half marathon! Finisher Medals for Half Marathon finishers and a generous 4:30 cutoff time. Courses follow a scenic mix of road and bike path through Arvada's beautiful west side. Long-Sleeve Gender-Specific Tech Shirts, hot cocoa, breakfast burritos from El Senor Sol Mexican restaurant, and […]

  • hilly Cheeks Duathlon Series logo

    Chilly Cheeks Duathlon Series

    Hobie Park 4800 S. Dayton St., Greenwood Village, CO, United States

    Denver's low key, low cost multisport winter series!!! The Chilly Cheeks Winter Series is composed of three fun run-bike events at the Cherry Creek Reservoir. We provide a marked and marshaled course, fast & accurate chip timing, light refreshments, and some fun mid-winter competition in the heart of Denver.

  • Aspen Snowmass

    Audi Power of Four Ski Mountaineering

    Aspen Snowmass Aspen-Snowmass, CO, United States

    The Audi Power of Four Race Series is a premier endurance race series utilizing the unique and amazing terrain of each of the four Aspen Snowmass mountains. Each race is designed to test the limits and skills of both elite and recreational athletes.

  • NOCO Half Marathon & 10K

    NOCO Half Marathon & 10K

    Boyd Lake State Park (Loveland) 3720 N County Road 11-C, Loveland, CO, United States

    Spring is the season of renewal and running. We hope you join us for a fun adventure that embodies the spirit of springtime at the beautiful Boyd Lake State Park! Choose from the Half Marathon (13.1 mile) or 10K (6.2 mile) for your run adventure. This course is on smooth paved walkways with about three […]

  • Ordinary Mortals

    Ordinary Mortals Triathlon

    Pueblo 2200 Bonforte Blvd, Pueblo, CO, United States

    Ordinary Mortals Triathlon (OMT) is a reverse order sprint distance (5 km run, 12.5-mile bike, 300-yard pool swim) triathlon for all us "Ordinary Mortals" - from the first time triathlete to more competitive triathletes on a fun and challenging course. Bring the kids for the youth triathlon, Mini Mortals Triathlon, after the adult race. This […]

  • Without Limits Productions

    Stroke & Stride

    Boulder Reservoir 5275 Reservoir Road, 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 reservoir dam on 8 Thursday evenings (plus one Wednesday evening) throughout the summer. Many participants make their open-water swimming debut in the beginner-friendly Stroke & […]

  • Without Limits Productions

    Colorado Triathlon

    Boulder Reservoir 5275 Reservoir Road, Boulder, CO, United States

    Colorado Sprint Triathlon: 750 meter swim, rolling and fast 17 mile bike, and finishes with a 3.1 mile run Colorado Olympic Triathlon: 1500m swim, 23.5 mile bike, and a 10k run Colorado Olympic Duathlon: 5k run, 23.5 mile bike, and a 10k run Colorado Aquabike: Will feature a 1500 meter swim and a 24.8m bike

  • Without Limits Productions

    Stroke & Stride

    Boulder Reservoir 5275 Reservoir Road, 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 reservoir dam on 8 Thursday evenings (plus one Wednesday evening) throughout the summer. Many participants make their open-water swimming debut in the beginner-friendly Stroke & […]

  • IRONMAN 70.3 Boulder

    IRONMAN 70.3 Boulder

    Boulder Reservoir 5275 Reservoir Road, Boulder, CO, United States

    Presale Registration for 2023 IRONMAN 70.3 Boulder opens at 10am MT on Thursday, August 4, 2022.

  • Without Limits Productions

    Stroke & Stride

    Boulder Reservoir 5275 Reservoir Road, 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 reservoir dam on 8 Thursday evenings (plus one Wednesday evening) throughout the summer. Many participants make their open-water swimming debut in the beginner-friendly Stroke & […]

  • Without Limits Productions

    XTERRA Lory

    Lory State Park (Fort Collins) 708 Lodgepole Drive, Bellvue, CO, United States

    XTERRA Lory Triathlon on June 18th is the perfect kick-off to the year for the seasoned off-road triathlete, or a great opportunity for the road triathlete wanting to try out a mountain bike triathlon for the first time. The XTERRA Lory Triathlon features a 1/2 mile swim in the clear waters of Horsetooth Reservoir (Eltuk […]

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