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  • Collegiate Peaks Trial Run

    Buena Vista Community Center 715 E Main St, Buena Vista, CO, United States

    The Collegiate Peaks Trail Run takes place in Buena Vista, Colorado and offers two race distance options - 25 miles and 50 miles. The race was established in 1991 and […]

  • runBlossom 5K

    Centennial Park - Cañon City Cañon City, CO, United States

    Event Information: For 20 years, the annual runBlossom race has helped usher in the summer season in Cañon City. As the snow melts and the leaves begin to adorn trees, […]

  • Niwot’s Challenge

    Sedalia Post Office 4195 Douglas Ave, Sedalia, CO, United States

    Niwot’s Challenge is a very difficult, grass-roots, ultramarathon in Colorado’s Front Range. It is modeled after the arduous Barkley Marathons in Tennessee, and the historic More and More Difficult 50K […]

  • Duck Waddle 5K

    Lake Estes Marina 1770 Big Thompson Drive, Estes Park, CO, United States

    Our Vision: Experiencing physical activity with a group encourages motivation, emotional wellbeing, accountability, fun and friendships. By providing athletic events we hope to inspire youth, families and individuals to enjoy […]

    $30 – $40

  • Hope House 5K

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

    Our 13 annual Hope House 5K & Fun Run will take place on Saturday, May 2, 2026 at the Promenade Terrace Park (South of the Westin Westminster)! It will be a fun-filled […]

  • Furry Scurry

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

    The Furry Scurry is an annual, pet-friendly, fun-filled festival and two-mile dog walk at Denver’s Washington Park to benefit the animals in our care. This year, people can gather in person on Saturday, May […]

  • Walk MS

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

    Walk MS includes a powerful new experience where you’ll witness how your support changes the lives of people with MS and gets us closer to our ultimate goal: a cure. […]

  • Longmont Half and 5K

    Longmont Rec Center 310 Quail Rd., Longmont, CO, United States

    Longmont's only Half Marathon - now offered in the cooler month of MAY! Join the Half Marathon or 5k distance! Walkers and Runners of all abilities welcome!

  • Moose Mudder

    Altitude Elementary School 27300 East Southshore Drive, Aurora, CO, United States

    Please join us for the Annual Moose Mudder! This is a community event that will consist of an untimed 1k fun walk/run and a timed 5k followed by an optional […]

  • Emerge 5K

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

    The Emerge 5K is our biggest annual fundraiser, and the funds we raise ensure that we can continue to fulfill our organizational mission of breaking the social and financial barriers […]

  • Blue Ribbon 5K/10K

    Memorial Park - Silverton 1800 Greene St, Silverton, CO, United States

  • Grand Mesa Ultras

    Mesa Top Trailhead 25930 Grand Mesa Scenic Byway, Cedaredge, CO, United States

    Come enjoy some of the best mountain running in Western Colorado! Our races are held on the Grand Mesa, the largest flat-topped mountain in the world where the average elevation […]

  • Best Buddies Friendship Walk

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

    The Best Buddies Friendship Walk is the leading event in the country supporting inclusion for people with intellectual and developmental disabilities (IDD). Join 50,000 participants at 70+ Walks across the […]

  • Quad Rock Trail Race

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

    Welcome to the Quad Rock 50 and 25 mile trail races, an event put on by trail runners for trail runners. Taking place on the trails and hills west of […]

    $125 – $170

  • Valkyrie Women’s Trail Race

    Cheyenne Mountain State Park 410 JL Ranch Heights, Colorado Springs, CO, United States

    Valkyrie Trail Race was created as a women only trail/ultra event,  featuring Colorado Spring’s, Cheyenne Mountain State Park.  The race offers amazing views of the city and a diverse eco-system. We have several […]

  • CMRA Tucker Lake 6.5

    Colorado Tap House - Arvada 14982 West 69th Avenue, Arvada, CO, United States

    The race will start near the Colorado Tap House parking lot and head west along the Ralston Creek Trail toward Tucker Lake. Once reaching Tucker Lake runners will loop around […]

  • Five Star 5K

    Riverdale Regional Park 9755 Henderson Road, Brighton, CO, United States

    Adams 12 Five Star Schools is invested in the Whole School, Whole Community, Whole Child (WSCC) approach to education and is committed to ensuring that all students are safe, supported, […]

  • Carbon Valley Half Marathon

    Firestone Regional Sports Complax 6850 Tilbury Avenue, Firestone, CO, United States

    Colorado at its Best – the Carbon Valley Half Marathon will showcase the beauty & diversity of Colorado’s best kept secret.  Small town charm with Big City services, nestled between […]

  • Hometown Half Marathon

    Norris Penrose Event Center 1045 Lower Gold Camp Rd, Colorado Springs, CO, United States

    Join us for the annual Hometown Half Marathon & 5k/10k! A run local-themed event that is perfect for the whole family. The fun includes great swag (designer shirt, custom medal), […]

  • Colorado Rockies Home Run 5K

    Coors Field 2001 Blake St, Denver, CO, United States

    Take part in the Colorado Rockies Home Run 5K Run/Walk (3.1 miles) that includes a scenic downtown course and lap around the warning track of Coors Field, there will also […]

  • Happy Smackah 5K

    McIntosh Lake 1905 Harvard St, Longmont, CO, United States

    Join your fellow community members at our annual 5K Fun Run/Walk supporting local families facing medical hardship.

  • Mother’s Day Trail Run

    Louisville Community Park 955 Bella Vista Dr, Louisville, CO, United States

    A new Race Series for Colorado with 2 races over the Weekend for both WOMEN/Moms and their families!....Saturday, MAY 10th, 5k & Family 1 mile in Denver at GREAT LAWN […]

    $35.00

  • Science Stride 5K

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

    The Friends of the National Center Science Stride 5k brings together our community for a common cause: Inspiring the next generation of scientists! This event provides an excellent opportunity for […]

    $50

  • Run for the Trees

    Mahaffey Park 3285 W 22nd St, Loveland, CO, United States

    We’re helping Parks and Rec celebrate Loveland's Arbor Day. Come enjoy food trucks, live music, and a 2 mile fun run to help raise money for the tree planting fund. […]

  • Women’s Distance Festival 5K

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

    The Womens’ Distance Festival is no longer an event for “women only”. This event is now a “community” event, supporting the Girls on the Run® of the Rockies. Girls on […]

  • Race for the Watershed 5K

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

    Join us for a fun-filled day of running, walking, and most of all, supporting the Cherry Creek Watershed! Lace up your shoes and get ready to hit the trail with […]

  • Run to the Shrine

    Featured Run to the Shrine
    Cheyenne Mountain Zoo 4250 Cheyenne Mountain Zoo Road, Colorado Springs, CO, United States

    Join us on Saturday, May 9 or Sunday, May 10, 2026, for Run to the Shrine, Cheyenne Mountain Zoo’s annual fundraiser run/walk. This 4-mile casual run/walk winds through the Zoo […]

  • Hometown Half Marathon

    Chatfield State Park 11500 N. Roxborough Park Rd, Littleton, CO, United States

    Join us for the annual Hometown Half Marathon & 5k/10k! A run local-themed event that is perfect for the whole family. The fun includes great swag (designer shirt, custom medal), […]

  • Space Race 5K

    Wings Over the Rockies Air & Space Museum 7711 East Academy Blvd, Denver, CO, United States

    ✨Prepare for launch! ✨ The Wings Space Race 5K invites you to push past your limits and chase the stars into an experience that’s truly out of this world! Join […]

  • Colorado Women’s Classic

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

    We are excited for the 2026 Colorado Women's Classic! While focused on women, all genders are WELCOME at this event!

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