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  • 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 […]

  • Lafayette Music Fest 5K/10K

    JAX Lafayette Farm & Ranch 400 W South Boulder Rd, Lafayette, CO, United States

    Lafayette Music Fest is put on by Rock for the People, a 501(c)(3) nonprofit organization in Lafayette, CO with the mission of building an inclusive live music community by offering […]

  • Ethiorado 5K

    Granifera 600 Telluride St, Aurora, CO, United States

    Join us this fall for a community 5K Run/Walk in Aurora, CO — a fun, family-friendly event open to runners, walkers, and everyone in between! Whether you’re chasing a personal best […]

  • 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

  • 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 & […]

  • Miner Gold Rush 5K

    Prospect Ridge Academy 2555 Preble Creek Pkwy, Broomfield, CO, United States

    Prospect Ridge Academy is thrilled to present our Annual Miner Gold Rush and Fall Festival! All proceeds will benefit Prospect Ridge Academy, a public charter school providing a rigorous, quality […]

  • 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, […]

  • FAMpoint5K

    Western Colorado Botanical Gardens 655 Struthers Way, Grand Junction, CO, United States

    Join us for FAMpoint5K: The Race for the Rest of Us on Saturday, October 3, 2026 at 2:00 p.m. at the Western Colorado Botanical Gardens. we are so excited to […]

  • 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 […]

  • Splashland Triathlon

    Splashland Swimming pool 5895 CO. Hwy 17, Alamosa, CO, United States

    Catch a glimpse of the Great Sand Dunes National Park with six 14’nrs in the background Mt. Blanca, Colorado’s 3rd highest peak overlooks the valley floor.

  • 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 […]

  • Liberty Energy 5K

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

    Please join Liberty for our 5K run and walk, benefitting the Bettering Human Lives Foundation. This family-friendly event will include live music, a beer garden, face painting, food trucks, and […]

  • Fall Foliage Fun Run

    Bunny and Clyde's 203 W 1st St, Salida, CO, United States

    The best time of the year to be in Colorado! Aspen trees, perfect weather, less crowds. You don't want to miss this experience!

  • 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

  • Suffer Better 50K/25K Trail Run

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

    We are stoked to once again invite you all to come run with us at Staunton State Park, off of Highway 285 near Conifer, CO, on October 15, 2022.  We […]

    $65

  • ASDAsh 5K to Beat Tooth Decay

    Boettcher Commons 13120 E 19th Ave, Aurora, CO, United States

    Join us for the University of Colorado School of Dental Medicine's Annual ASDAsh 5K to Beat Tooth Decay! This year, we will be starting and ending at Boettchers Commons! Additionally, […]

  • Breckenridge Road Marathon

    Breckenridge Recreation Center 880 Airport Road, Breckenridge, CO, United States

    Join us for an unforgettable two-day running experience in the heart of Breckenridge! Our RunFest Weekend kicks off Saturday with a 5K, 10K, along Main Street, followed by the Half […]

  • 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

  • Lions Roar for Fitness 5K/2.5K

    Lake Minnequa 1500 Lakeview Ave, Pueblo, CO, United States

    So What Is the Lions Roar for Fitness 5k/2.5K Challenge? 5K Challenge — Starts promptly at 9:00 a.m. at Lake Minnequa (near CIMS), but please arrive by 8:15 a.m. There will […]

  • 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 […]

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