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  • Summer Sizzler 5K

    Cottonwood Creek Park 3920 Dublin Blvd, Colorado Springs, CO, United States

    Join us on July 15th, 2023 for the annual Summer Sizzler, featuring the amazing scenery of America the Beautiful Park!  Whether you are looking to run, walk or just enjoy […]

  • Erie Half

    Reliance Park 900 Weld County Road 1.5, Erie, CO, United States

    Join us for the Erie Half and 5k! The Hometown Race Series features half marathons and 5k distance events in outlying communities outside the Denver and Boulder metro areas. LOOK […]

  • Race for Research 5K

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

    The Annual Cancer League of Colorado Race for Research 5K is excited to be back to the full event you love at Washington Park in Denver! The Race for Research […]

  • Lory Summer Trail Series

    Into the Hills Eltuck 5K

    Lory State Park 708 Lodgepole Dr, Bellvue, CO, United States

    Join us each Tuesday evening in August for a fun series of shorter midweek trail races. Our goal is to offer a fun, low-key series of races designed to give […]

    $25 – $80

  • NoCo Urban Ultra & Relay

    Island Grove Park 501 N 14th Ave, Greeley, CO, United States

    A collaboration event between run.Windsor and Breakaway Athletic Events celebrating the Poudre River Trail. This long-distance race takes you on a sprawling tour of Northern Colorado via the picturesque Poudre River Trail. You'll enjoy […]

  • 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!)

  • Staunton Rocks! Trail Marathon

    Staunton State Park 12102 S Elk Creek Rd, Pine, CO, United States

    Welcome to the Staunton Rocks! Marathon & Half Marathon, an event put on by trail runners for trail runners on August 28, 2021. Touring the renowned singletrack of Staunton State Park in Colorado’s Front Range Mountains southwest of Denver, the race will take you back in time as you glide by historic buildings and old milling operations.

    $90 – $130

  • Impact Uganda 5K/10K

    Howell Construction 8085 E Harvard Ave, Denver, CO, United States

    UPDATE: New Route and New Swag The new route starts at the same location and avoids crossing streets. Check out the new SWAG for this year. The Fifth Annual Impact Uganda Fun […]

    $39

  • We Run So They May Walk 5K

    Saint Peter Lutheran Church 9300 East Belleview Ave, Englewood, CO, United States

    When: Saturday, August 23, 2025, 8:00 a.m. (Check-in begins at 7:15 a.m.) Where: begins and ends at Saint Peter Lutheran Church, 9300 E. Belleview Ave., Greenwood Village. $40  includes race […]

  • Featured Winter Park Peak to Peak Summer Showdown

    Byers Peak Stampede

    High Country Stampede Rodeo 1741 Co Hwy 73, Winter Park, CO, United States

    Push your limits with these stunning, remote races in the heart of the Rocky Mountains - located just 60 miles outside of Denver! Our Half Marathon and 5K are perfect […]

    $5 – $70

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    Please allow 48 hours after submission for an event to appear on the calendar. If you have already listed your event and would like us to update it, please contact us.

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