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  • Boulder XC Series I

    City Park - Valmont 5110 Valmont Rd, Boulder, CO, United States

    EVENTS 9:00AM 10 YEARS & UNDER - 1K 9:15AM 16 YEARS & UNDER - 3K (1 x 1K + 1 x 2K) 9:40AM OPEN - 5K (1 x 1K + […]

  • 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 […]

  • Kipling Villas 5K

    Lilley Gulch Recreation Center 6147 S Holland Way, Littleton, CO, United States

    This race will be throughout the trails in the Kipling Villas neighborhood near Lilley Gulch Recreation Center.

  • Saint’s Corp Pilgrimage Fun Run

    Yamaguchi Park 684 S 5th St, Pagosa Springs, CO, United States

    Join us in Pagosa Springs as we come together to support programs that build confidence, leadership, and real-world skills in our younger generation through hands-on, meaningful experiences. At Saint’s Corp, […]

  • Rise 5K

    Assembly Athletic Complex 1390 Shoshone St, Denver, CO, United States

    Get ready to lace up and show your Roadrunner pride at the Annual Roadrunners 5k—our favorite Homecoming tradition! Whether you’re a speedster, a stroller, or somewhere in between, everyone’s welcome […]

  • Rocky’s Backyard Ultra

    YMCA of the Rockies - Estes Park 2515 Tunnel Rd., Estes Park, CO, United States

    Rocky's Backyard Ultra is a challenging Ultra Trail race hosted in beautiful Estes Park, Colorado. We strive to host a challenging event that is welcoming and motivating to all. "One More […]

    $140

  • Riverside Ramble

    High Side Bar and Grill 300 W Sackett, Salida, CO, United States

    The Alliance and 7000ft Running Company present The Riverside Ramble! The Riverside Ramble is an accessible fun run that celebrates survivors in the outdoor community and emphasizes the necessity for […]

  • Canceled bRUNch Run 5K/10K

    Stapleton Central Park 8801 Martin Luther King Jr Blvd, Denver, CO, United States

    The bRUNch Run ™ is back! Join us in Denver for the most epic and delicious 5K + 10K run/walk. (There is also the 15K)! Think road race meets food […]

    $65 – $70

  • EDT XC Showdown

    Aurora Sports Park 19300 E Colfax Avenue, Aurora, CO, United States

    Whether you run for a team, as an individual, or you just want to try out the experience of running a cross country race, you are welcome to join us […]

  • Boulder Skyline Traverse

    Runners Roost - Boulder 629 S Broadway, Boulder, CO, United States

    The Boulder Skyline Traverse is a ~18 mile trail route that covers the 5 peaks of Boulder (South Boulder Peak, Bear Peak, Green Mountain, Flagstaff Mountain, and Mt. Sanitas). You'll […]

  • Cowboy Half Marathon

    Mancos Public Library 211 W. 1st, Mancos, CO, United States

    With a new race date for 2021, the Mancos Cowboy Half Marathon and 5k is a beautiful and scenic course with a mix of pavement, dirt road, and trail.  Grab […]

  • CSU Homecoming 5K

    CSU Oval Fort Collins, CO, United States

    The Homecoming Race will take place on the Oval for our traditional course. All ages and abilities are welcome. Proceeds from the Homecoming Race benefit the ongoing research efforts and […]

  • Crazy Cloverleaf

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

    We host one race per month from November to March.  All races are at Chatfield State Park and start at 9:00 am on Saturday mornings.  Check-in starts at 8:15 am.

  • Run Fur Fun Spooktacular 5K

    Odell Brewing Company 800 East Lincoln Avenue, Fort Collins, CO, United States

    Our Run Fur Fun 5k starts and ends at Odell Brewing Company in Fort Collins. Don't forget to wear a costume for the costume contest, enjoy the eclectic tunes of The Sugar […]

  • Canceled Run With The Panthers 8K

    Nederland High School 597 Co Hwy 130, Nederland, CO, United States

    Come join us at 8,410' for a fun and fast 8,410meter road race! This is a fun and welcoming local race benefiting the Nederland Middle/Senior High School PTA. This is […]

  • IACP 5K Fun Run

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

    Lace up and join us for the IACP 5K Fun Run at the 2025 International Association of Chiefs of Police Conference in Denver! This lighthearted, non-competitive run is your chance […]

  • Crimson Classic 5K

    University of Denver - Carnegie Green Lawn 2150 East Evans Ave, Denver, CO, United States

    The University of Denver's Annual Crimson Classic 5K Run/1.5 Mile Walk will take place on Carnegie Green Lawn. Music, stretching, and snacks will start at 2:15pm. The focus of the […]

  • Trick or Trot 5K

    Apex Center 13150 W 72nd Ave, Arvada, CO, United States

    Join the Apex Park and Recreation District Foundation for the inaugural Trick or Trot 5K! Runners and walkers of all ages and abilities are all welcome to join us for […]

  • Spooky Sprint 5K

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

    Get ready to lace up your sneakers (or your costume!) for Almost Home’s first-ever Spooky Sprint 5K! Join us on Saturday, October 25, 2025 at Margaret Carpenter Park in Thornton […]

  • YMCA Creepy Crawl 5K

    Palmer Lake Regional Park 199 County Line Road, Palmer Lake, CO, United States

    Our annual "spooky themed" race starts at the Palmer Lake Regional Recreation Area.  We head down the scenic Santa Fe Trail for a bit then turnaround and finish with a […]

  • Eerie Erie 5K/10K

    Erie United Methodist Church 604 Holbrook St, Erie, CO, United States

    The world-famous Eerie Erie is a Halloween-themed 5k and 10k race that runs through historic downtown Erie and takes advantage of our beautiful trail system that weaves along the Coal […]

  • Halloween Fun Run

    Clear Creek Middle School 320 Chicago Creek Rd, Idaho Springs, CO, United States

    This Halloween, join us for a spooky 5k or 1 mile loop through the Pioneer Cemetery in Idaho Springs!!  Try for a PR or take a leisurely stroll as you […]

  • Canceled Redrum Fun Run

    Lincoln Park - Greeley 829 10th Ave, Greeley, CO, United States

    Get ready to lace up your running shoes and unleash your spooky spirit at the Redrum Costume Fun Run 2025! Join hundreds of ghosts, goblins, superheroes, and wacky characters as […]

  • Quick Draw @ McGraw Trail Race

    McGraw Memorial Park 39 Wellington Lake Rd, Bailey, CO, United States

    Come one, come all! And join us in the "Quick Draw @ McGraw" 2 Mile Trail Run, organized and hosted by CRATES Colorado and benefitting McGraw Memorial Park. This challenging […]

  • Team Hope 5K

    Imondi Wake Zone 1583 Cipolla Road, Fruita, CO, United States

    The Rocky Mountain Chapter of the Huntington’s Disease Society of America (HDSA) will host the annual Heroes and Villains Team Hope Walk and 5K Run at Stapleton Central Park. Wear […]

  • BOO Run 5K

    Grand Valley Brew Runs
    WestCo Brewing 905 Struthers Ave, Grand Junction, CO, United States

    Costume up and bring your family and friends, we will haunt the town on our 5k route along the river while taking in the beautiful fall colors followed by a […]

  • Spooky Sprint 5K

    Pueblo YMCA 3200 E. Spaulding Ave, Pueblo, CO, United States

    This eerie evening race winds through a chilling course at the YMCA of Pueblo. The thrilling Halloween themed race is perfect for all ages and fitness levels. Recommended for those […]

  • The Stride 5K/10K

    Featured
    Littleton Museum 6028 S. Gallup St., Littleton, CO, United States

    You’re invited to The Stride, a family-friendly 5K, 10K, Kids Fun Run, and Wellness Expo in Littleton on October 24th. Benefitting the Littleton Public Schools Foundation, this event brings together the community for a great cause. 

    $17 – $46

  • Veterans Services Freedom 5K

    Roudebush Cottage 1815 8th Ave, Greeley, CO, United States

    This year UNC Veterans Services is hosting the UNC Freedom 5k. The run is a 3.1-mile route of obstacle-free running that is open to walkers, runners, ruckers, children, strollers, and […]

  • Colleen De Reuck XC Classic

    Harlow Platts Community Park 1360 Gillaspie Drive, Boulder, CO, United States

    The Colleen De Reuck Cross Country Classic is a XC meet honoring one of the world's greatest ever distance athletes and Boulder local, Colleen De Reuck. Every year we will celebrate […]

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