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  • Stego Stampede

    Dinosaur Ridge 16831 W Alameda Pkwy, Morrison, CO, United States

    The first-ever Stego Stampede over Dinosaur Ridge in Morrison, Colorado is a fun run (2 miles) for all ages (and dogs on leash) where costumes are encouraged and prizes will […]

  • 14er Fest 14K and 5K

    The Trailhead 402 E Main St, Buena Vista, CO, United States

    5K: Grab some of the family or friends and join us for this 3.1-mile fun run and race! The race starts and ends right in the heart of vendor village. […]

  • Greenland Pack Burro Race

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

    Welcome to the annual Greenland Open Space Pack Burro Races presented by Double Rainbow Ranch! Grab your burro and join us for a fun and rewarding day on the majestic […]

  • Lions Roar 5K

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

    Lions Roar 5K is a family friendly 5K to support Leawood Elementary School PTSA!  We welcome all ages and abilities.  Our race takes place at beautiful Clement Park in Littleton, […]

  • Joy & Justice 5K

    Timnath Reservoir 5824 County Rd 40, Timnath, CO, United States

    Join us for the Race for Joy & Justice 5K, a family-friendly run/walk event benefiting the Joy & Justice organization based in Timnath, Colorado. This exciting event brings together people […]

  • Bear Chase Trail Race

    Bear Creek Lake Park 15600 W Morrison Rd, Lakewood, CO, United States

    The Bear Chase Race Endurance Festival is a 100K, 50 Mile, 50K, Half Marathon, Baby Bear 10K and 5K trail race at beautiful Bear Creek Lake Park, in Lakewood, CO. […]

  • Arches Marathon

    Behind the Rocks Trailhead Moab, UT, United States

    Started in 2004 as a fall companion to the popular Canyonlands Half Marathon, Arches Half Marathon has hosted many runners on the road course. In 2021, Arches became a trail […]

  • Colorado Springs Marathon

    Featured
    Pioneers Museum 215 South Tejon Street, Colorado Springs, CO, United States

    Join us for the 13th Annual Colorado Springs Marathon on Saturday, October 3, 2026! Whether you're a seasoned runner or taking on your first 5K, we have four exciting race […]

    $8

  • Above the Clouds Ultra

    Woodland Park Middle School 600 E Kelley's Rd, Woodland Park, CO, United States

    Experience the amazing Colorado fall colors, fast and flowing singletrack of Rampart Reservoir and the spectacular sweeping views of America’s Mountain, Pikes Peak, in the inaugural Above the Clouds Ultra!

  • West Elk Trail Marathon

    Crawford State Park - Iron Creek Campground 40468 CO-92, Crawford, CO, United States

    The West Elk Challenge is a point-to-point trail marathon (with a 30K option) through Western Colorado’s North Fork Valley and West Elk Mountains at peak fall colors. But it’s also […]

  • Castle Rock Trail Festival

    Phillip S. Miller Park 1375 West Plum Creek Pkwy, Castle Rock, CO, United States

    Welcome to the Town of Castle Rock’s epic trail event. Come to challenge yourself on the vast ridgeline trail system and enjoy Castle Rock’s local trails. Trail run options range […]

  • Taco Bell 50K

    Taco Bell 447 S Broadway, Denver, CO, United States

    It has been described as Urban Legend. More mysterious and barking spiders than the Barkley Marathons. The International Taco Bell 50k boasts a higher DNF rate than the famed Leadville […]

  • Rim to Rim Royal Gorge Run

    Royal Gorge Bridge and Park 4218 Co Rd 3A, Cañon City, CO, United States

    Get ready for a ROYALly GORGEous experience! Whether you’re tackling the 5K, the 8-mile trail run, or the half marathon trail run, this event offers something truly special. All three […]

  • Sage Burner Trail Race

    Hartman Rocks Recreation Area Gunnison, CO, United States

    Nestled in the Rocky Mountains, about 2 hours east of Grand Junction and 3 hours west of Denver, lies a small running jewel called Gunnison, Colorado. Visit Gunnison, and you’ll […]

  • Spooky Sprint Half Marathon

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

    Join us for the annual Spooky Sprint 5k/10k & Half Marathon! A fun, Halloween-themed event that is perfect for the whole family.

  • The Ruff Run

    Boyd Lake State Park 3720 N Co Rd 11C, Loveland, CO, United States

    Discover the ultimate Colorado adventure: a thrilling dog-and-runner race (2 miles) that celebrates your passion for running, the unbreakable bond with your pet, and the pure joy of playful challenges. […]

  • Grand Valley Backyard Ultra

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

    This is a true last-man-standing event, and it will go until there is only one runner left, no matter how long it takes. Unlike all other competition race formats, this […]

  • Outlast Denver

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

    OUTLAST is a 6-hour trail endurance challenge where runners complete a 5K every hour, on the hour. Each lap must be finished within the hour to stay in the event. […]

  • The Pretzel Run

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

    Oktoberfest in Colorado!! Owned and managed by a Bavarian Race Director.... The Annual PRETZEL RUN will move 8 blocks down to Louisville Community Park for a LARGER BIER GARDEN, LIVE […]

    $35.00

  • Rut Run 5K

    United Methodist Church - Estes Park 1509 Fish Hatchery Rd, Estes Park, CO, United States

    With the Fall Season, Estes Park shines in colors and wilderness experiences! Herds of Elk begin to roam the meadows and open fields; while sounds of bugling Bull Elk call […]

  • I Can 5K

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

    You CAN 5k. This event is for EVERY ONE. EVERY BODY. You won't get lost. You won't get forgotten. You'll run a clearly marked 5k loop with multiple portojohns & […]

  • Miles for Moms

    Huston Lake Park 850 S Bryant St, Denver, CO, United States

    Join us at the FloCrit campus and surrounding neighborhoods in southwest Denver for the Annual Miles for Moms Run/Walk/Roll! Lace up your running shoes for a fantastic 3-mile fundraiser run, […]

  • Crazy Horse Fast 5K

    Featured
    Crazy Horse Memorial Ave of the Chiefs, Crazy Horse, SD, United States

    The Run Crazy Horse Marathon events begin in the shadow of the world's largest mountain carving,  Crazy Horse Memorial, and finishes in the heart of the Black Hills... Hill City, […]

  • Grace Race 5K

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

    Help eRace World Hunger at Rainbow Trail Lutheran Camp’s Annual Grace Race!  This annual 5k run/walk was started as part of RTLC’s 50th anniversary in 2007, to raise money for […]

  • Hot Chocolate 15K/10K/5K

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

    Start and finish at Civic Center Park amongst Denver's biggest chocolate aficionados. All participants receive a technical running quarter zip with registration. Runners can also enjoy hot chocolate, chocolate fondue, […]

  • Windsor Marathon

    The Island at Pelican Lakes 1620 Pelican Lakes Point, Windsor, CO, United States

    Welcome to the annual Windsor CO Race! This year's event will start and end at The Island at Pelican Lakes in Water Valley, with a great after party including beer, […]

  • Run Crazy Horse Marathon

    Featured
    Crazy Horse Memorial Ave of the Chiefs, Crazy Horse, SD, United States

    The Run Crazy Horse Marathon events begin in the shadow of the world's largest mountain carving,  Crazy Horse Memorial, and finishes in the heart of the Black Hills... Hill City, […]

  • OTILLO Swimrun

    Horsetooth Reservoir 4200 W County Road 38 E, Fort Collins, CO, United States

    Welcome to the world of ÖTILLÖ Swimrun! ÖTILLÖ Swimrun, the original swimrun race, embodies the spirit of adventure, endurance, and teamwork. Originating in Sweden, ÖTILLÖ translates to “island to island” […]

  • Michael J. Fox Foundation’s Run/Walk

    Great Lawn Park 101 Yosemite St, Denver, CO, United States

    We're excited to invite you to be a part of The Michael J. Fox Foundation’s Denver Run/Walk, a community event dedicated to raising awareness and funds for Parkinson's research. Lace […]

    $20 – $65

  • Rubey Rescue Run

    Buttermilk Ski Resort 38700 Highway 82, Aspen, CO, United States

    Join us for a 5K uphill race on Buttermilk Mountain—with your furry friends, or without! Starting at the base near Buttermilk Mountain Lodge (formally known as Bumps) and climbing 1,700 […]

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