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  • 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), […]

  • 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!

  • Super Mom Half Marathon

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

    Celebrate the incredible strength, love, and spirit of moms everywhere at the Super Mom 5K/10K/Half Marathon! Whether you are a mother, are running for a mother, or simply want to […]

  • Fruita Trail Half Marathon

    18 Road Trailhead 18 Road, Loma, CO, United States

    This exciting half marathon course is a fun loop on the beautiful flowy single track in Fruita CO. With short steep climbs and descents featuring beautiful views of the nearby […]

    $105

  • Mother’s Day 5K

    Featured
    City Park - Denver 2001 Steele St, Denver, CO, United States

    The Denver Mother's Day 5K – It's What Colorado Moms Do! This year, all-you-can-eat pancakes and three sausage breakfasts with OJ or coffee will be provided by Flippin' Flapjacks for all registered participants. […]

  • Ram Party Trail Runs

    Buffalo Lodge Bicycle Resort 2 El Paso Blvd, Colorado Springs, CO, United States

    With plenty of race options for everybody centered around the beautiful Rampart Reservoir in Woodland Park, Colorado, you're sure to have a good time while you take in the epic […]

  • Dog Jog 5K

    Laramie Community College 1400 E College Dr, Cheyenne, WY, United States

    The Dog Jog 5k is back and better than ever! Join the pack and run for a cause. This dog friendly 5k welcomes runners and walkers of all ages (even […]

    $35

  • Endure Trail Runs

    Mueller State Park 21045 State Highway 67, Divide, CO, United States

    The Endure 12-Hour is a one-of-a-kind challenging 12-Hour timed event, designed by YOU… and tiny colorful balls. Each runner will pull colored balls from a bucket, which determines the loop they’ll […]

  • Tour de Victory

    YMCA of Northern Colorado 2800 Dagny Way, Lafayette, CO, United States

    Join the Tour de Victory Cycling Challenge, Colorado’s premier Parkinson’s bike ride benefiting the Davis Phinney Foundation. This boutique bike ride is an opportunity to join the Davis Phinney Foundation’s inspiring community and make a positive impact on the […]

  • Boneyard Boogie Trail Run

    Vail Trail Running Series
    Eagle Pool and Ice Rink 1700 Bull Pasture Road, Eagle, CO, United States

    The Boneyard Boogie kicks off the 2025 Vail Trail Running Series with a 14K or 6K scamper through pinyon groves and juniper shrubs on some of Eagle's most scenic single […]

  • Vallecito Lake Heavy Half

    Vallecito Lake 17454 Co Rd 501, Bayfield, CO, United States

    The Vallecito Lake Heavy Half Marathon is a beautiful and scenic course around Vallecito Lake. Nestled in the heart of the San Juan Mountains in Colorado, our race course takes […]

  • Gluten Free Gallop

    Clement Park 7306 W. Bowles Avenue, Littleton, CO, United States

    Join Denver Celiacs to raise awareness of celiac disease and all gluten-related disorders. Our 13th Annual Gluten Free Gallop 5K will take place at Clement Park in Littleton, CO, on […]

  • Ouray Backyard Ultra

    Fellin Park 1001 US-550, Ouray, CO, United States

    A Backyard Ultra. Complete an easy 4.167 mile course. If you finish in less than an hour—just a 14:24 pace per mile—you get to do it again at the top […]

  • Colfax 5K

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

    Come run City Park in the Colfax 5K!  Go for a PR in this chip-timed race – separate stroller-friendly start wave for families and walkers.  And, you can run with […]

  • Colfax Marathon

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

    New for our 20th Year! “WOW” at Every Mile To celebrate our 20th, every mile will have a WOW for runners. That moment every mile that gives you that WOW […]

  • Wild Horse Half Marathon

    High Lonesome Ranch 275 CR 222, De Beque, CO, United States

    Set against the breathtaking backdrop of the luxurious High Lonesome Ranch, this isn’t just a race—it’s a full weekend of adventure and celebration! Runners will enjoy a country cookout, campfires, live […]

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