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  • 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 […]

  • Strides for Sierra 5K

    Sierra Elementary 7771 Oak St, Arvada, CO, United States

    Get your sweat on running or enjoy a leisurely stroll through the beautiful neighborhood surrounding Sierra Elementary!  Starting at 10:00am the little ones can participate in a 1K fun run […]

  • PPRR Fall Series I

    PPRR Fall Series
    Bear Creek Regional Park 245 Bear Creek Road, Colorado Springs, CO, United States

    The Fall Series consists of four trail races in four different city/county parks. The trails range from well-maintained to rocky with tree roots. Each event is a unique challenge at […]

  • Long View Marathon

    City Park - Fort Collins 1500 W Mulberry St, Fort Collins, CO, United States

    Showcasing a unique city-to-city trail connection, The Long View Marathon and Half Marathon runs from Fort Collins to Loveland. Together, Gnar Runners and Sweetheart City Racing bring a unique collaboration […]

    $65 – $120

  • CMRA Stone House Triple-Cross

    Stone House Park 2800 S. Estes St., Lakewood, CO, United States

    The race will begin just west of Estes St across from the Stone House Park on Bear Creek in Lakewood. It will head west mostly on dirt trails through the […]

  • Colorado Believe 5K

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

    Know that you're part of something bigger. By raising awareness, we can help other families who may still be searching for answers. Any funds raised will go to Dup15q Alliance […]

    $45.00

  • Manitou 5K

    Fields Park 114 El Paso Blvd, Manitou Springs, CO, United States

    Come celebrate the beauty of Manitou Springs! Race starts and ends in Fields park. Run along the rolling creek, view the art along the Creekwalk, loop the beautiful parks full […]

  • Westy Half and 5K

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

    Join the WESTY HALF and 5k this fall! The Hometown Race Series features half marathons and 5k distance events in outlying communities outside the Denver and Boulder metro areas. This […]

    $45 – $80

  • Breakthrough T1D Walk

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

    As the leading global type 1 diabetes (T1D) research and advocacy organization, Breakthrough T1D has played a crucial role in nearly every major T1D breakthrough in history. No organization does […]

  • Durango Marathon

    Santa Rita Park Camino Del Rio, Durango, CO, United States

    The inaugural Durango Marathon, Half Marathon, and 5k debuts on October 11, 2026, and you are invited to experience one of Colorado’s most beautiful mountain towns at the height of […]

  • Run the Rocks

    Red Rocks Amphitheatre 18300 W Alameda Pkwy, Morrison, CO, United States

    We are hosting our 21st annual Run the Rocks on October 11th from 8:15AM - 1PM. We’re biased, but we think it’s an event no one should miss! Run the Rocks […]

  • Indian Creek Fifties

    Indian Creek Campground 2499 Pine Creek Rd, Sedalia, CO, United States

    The Indian Creek Fifties takes advantage of the challenging and little used terrain just southwest of the Denver Metro area. Loop 1 climbs to 8000′, and quickly flows down into […]

  • Bobcat Trail Races

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

    Bobcat Trail Race was created to feature one of Colorado Spring’s best city parks, Palmer Park. Runners will enjoy views of the city and Pikes Peak from the rocky bluffs. […]

  • Blue Sky Trail Marathon

    Blue Sky Trailhead County Road 38e, Fort Collins, CO, United States

    Taking place on the trails between Horsetooth Mountain Park and the Devil’s Backbone Open Space, the Blue Sky courses take you on a north-south tour of the easternmost hogbacks of […]

    $90 – $130

  • Living Water 5K

    Berkeley Lake Park 4601 W 46th Ave, Denver, CO, United States

    5K Fun Run race and family friendly 1mile run/walk to help support communities who are in dire need of clean, sustainable water solutions and those suffering from recent disasters. The […]

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