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  • Stocking Run 5K

    Racing Underground Winter Running Series
    Village Green Park - Superior 1 Superior Drive, Superior, CO, United States

    Join us on Saturday December 13th for a fun and festive, family-friendly 5K run and walk in the town of Superior - conveniently located off Highway 36 between Denver and […]

  • Winterfest 5K

    Carpenter Park 3498 E 112th Ave, Thornton, CO, United States

    Kick off the holiday season with a spirited run/walk at Thornton's Carpenter Park. Choose from the chip-timed 5k, or experience the festive atmosphere in a shorter distance in our untimed […]

  • Jingle Bell Run

    Washington Park - Denver 701 S Franklin St, Denver, CO, United States

    Get ready for this year’s Jingle Bell Run, the original festive race for charity brought to you by the Arthritis Foundation. Wear your favorite holiday gear, and let's jingle all […]

  • Santa’s Dash for Ca$h

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

    Join 3W Races on December 18th at Sloan's Lake Park. Collect your prize envelope at the finish line for gift cards from local businesses and maybe even CA$H!

  • Chilly Cheeks Winter Duathlon

    Chilly Cheeks Winter Duathlon Series
    Cherry Creek State Park 4201 S Parker Rd, Aurora, CO, United States

    The Chilly Cheeks Duathlon Series is now a stand-alone event held in late February. The 63rd Chilly Cheeks Duathlon will be held in the traditional format of Run-Bike-Run. Both runs […]

  • Three Creeks Half Marathon

    Cherry Creek State Park 4201 S Parker Rd, Aurora, CO, United States

    Racing Underground brings you an amazing half marathon this spring! The Three Creeks Half Marathon features a half marathon course that is flat, fast and scenic! Travel on foot through […]

  • Platte River Half Marathon

    Reynolds Landing 6745 S. Santa Fe Drive, Littleton, CO, United States

    Denver's oldest half marathon runs along the Platte River Trail, covering parts of Littleton and Denver.

  • Rattler Trail Race

    Palmer Park 3343 Paseo Rd, Colorado Springs, CO, United States

    Rattler was created to feature one of Colorado Springs' best city parks, Palmer Park.  Runners will enjoy views of the city and Pikes Peak from the sandstone bluffs, while running […]

  • Greenland Trail Race

    Featured
    Greenland Open Space 1532 E Noe Rd, Larkspur, CO, United States

    The Greenland Trail Race offers four outstanding distances in southern Douglas County. Run the 4 Miler, the 8 Miler, the 25K, or tackle the 50K ultramarathon, Colorado’s fastest 50K! With Pikes Peak as your backdrop, you’ll cruise over a soft dirt trail on your way to a new personal best. With chip timing, an innovative technical running shirt in men’s and women’s sizing, food and beer at the finish, this race will make you want to come back for more!

  • Colorado Marathon

    Washington Park - Fort Collins 301 Maple St, Fort Collins, CO, United States

    Marathon, Half Marathon, 10k, 5k and 3-Person Marathon Relay.  Marathon, Marathon Relay and Half Marathon runners get to run down the scenic, downhill Poudre Canyon to the finish in Old […]

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