Event details subject to change. Please confirm all information via event website.

Events Search and Views Navigation

Event Views Navigation

Filters

Changing any of the form inputs will cause the list of events to refresh with the filtered results.

Today

  • Lakewood Trail Running Series IV

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

    The popular trail running series in Bear Creek Lake Park takes place weekly in September. Different routes allow participants to explore all areas of the park. Racers can compete against […]

    $55 – $70

  • Red Feather Trail Jamboree

    Ben Delatour Scout Ranch 2331 County Rd 68C, Red Feather Lakes, CO, United States

    Come enjoy the clean air and wild spaces of the Red Feather Lakes region in Northern Colorado at the Red Feather Trail Jamboree on September 17th. This 50K and half marathon takes place at the Ben Delatour Scout Camp and are designed to be beginner (or PR) friendly.

    $90 – $370

  • Sangre de Cristo Ultras

    Music Meadows Ranch 6076 Co Rd 119, Westcliffe, CO, United States

    Come join us on the Rainbow Trail in the Sangre de Cristo mountains. Run beneath the watchful eye of these gorgeous, and ominous, mountains. This race is full of festivities, […]

  • WILD Wahatoya Runs

    Cuchara Mountain Park 1234 Panadero Ave, La Veta, CO, United States

    Announcement: All Course Profiles and GPX files are released on the race website! Come join us to run through a magical part of history in the Cuchara Valley. The Spanish […]

  • Crested Butte Ultra

    Crested Butte Community School 818 Red Lady Ave., Crested Butte, CO, United States

    Crested Butte is known for having some of the best trails in the country. Runners will be challenged by this high altitude course. Its wide open views will amaze runners […]

  • Cougar Ridge Classic

    Vail Village 292 E Meadow Dr, Vail, CO, United States

    Join the Vail Recreation District for the annual Cougar Ridge Classic 26K, a point-to-point sub-ultra trail race. Challenge your legs, lungs and mind as you climb up Vail Mountain and […]

  • West Line Winder 50K

    Buena Vista Heritage Museum 506 E Main St, Buena Vista, CO, United States

    With glorious views of the Collegiate Peaks and 4,000ft of ascent along the way, these 30 miles of buttery single track and forest roads in the heart of the valley are perfect for everyone from the first time 50k’er to the veteran trail runner. Join the fun on September 25th in Buena Vista, CO.

  • Monument Marathon

    Featured
    Five Rocks Amphitheater 200701 Co Rd P, Gering, NE, United States

    Register for Nebraska’s Most Beautiful Race - the Monument Marathon, Half Marathon and 5K on September 24th in Gering, just two hours from Fort Collins. Experience towering natural landmarks, pine-covered hills, rugged badlands, and a rural landscape that provides a stunning and tranquil experience. Run along part of the Oregon Trail, the course traverses through Mitchell Pass and around Scotts Bluff National Monument.

  • Great Bison Shuffle

    Terry Bison Ranch 51 I-25 Frontage Road, Cheyenne, WY, United States

    Join the Cheyenne Regional Medical Center Foundation for this scenic trail run/walk at the Terry Bison Ranch. The terrain includes gentle rolling prairie pasture, a short rocky hill we refer […]

  • 24 Hours of Palmer Lake

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

    24 Hours of Palmer Lake is back! This race features 24 hours of a gorgeous 0.82 mile loop course surrounded by mountains on top of the Palmer Divide at an […]

    $65

  • Get Your Rear In Gear 5K

    Fossil Creek Park Lemay Avenue, Fort Collins, CO, United States

    Being part of a Get Your Rear in Gear event means joining North America’s largest grassroots movement in the fight against colorectal cancer. Your actions and voice have the power […]

    $30.00

  • So Long to Summer 5K/10K

    Parker Recreation Run Series
    Salisbury Park 11920 N Motsenbocker Rd, Parker, CO, United States

    Part of the Parker Parks and Recreation Run Series, this event is professionally timed. Registered participants will receive a race shirt, custom bib and a delicious post-race pancake breakfast. The […]

  • Golden Leaf Half Marathon

    Fanny Hill 120 Lower Carriage Way, Snowmass Village, CO, United States

    13.1 mile trail race with nearly 1000 ft of elevation gain from Snowmass to Aspen

  • Lisa Nelson’s Mustang Stampede 5K

    Ralston Valley High School 13355 West 80th Avenue, Arvada, CO, United States

    Lisa Nelson's Annual Mustang Stampede 5K Memorial Scholarship Run/Walk in memory of Lisa Nelson, a beloved faculty member of Ralston Valley High School. Lisa passed away from cervical cancer in […]

  • Canceled Mountain Chile Cha Cha Trail Races

    Reservoir River Ranch Pagosa Springs, CO, United States

    The Mountain Chile Cha Cha Trail Race offers a 5K and 10k race. The races begin just outside downtown Pagosa Springs, CO, on Reservoir River Ranch, where you'll run on […]

  • Heritage Days 5K

    Mill Street Bistro 135 W Mill St, Bayfield, CO, United States

    Enjoy a beautiful, fun 5k after watching the sheep come through town, and the parade. We will start at the end of the parade on Mill Street and end at […]

  • Black Canyon Triathlon

    Montrose Community Recreation Center 16350 Woodgate Rd, Montrose, CO, United States

    The Montrose Recreation Foundation proudly presents the  22nd Annual Black Canyon Triathlon will be held Saturday, September 30, 2023. This event attracts about 200 athletes and their families annually to […]

  • Mesa County Search & Rescue 5K

    Fruita Community Center 324 N Coulson, Fruita, CO, United States

    Fruita Fall Festival - Mesa County Search & Rescue 5K Race HOSTED BY MESA COUNTY SEARCH AND RESCUE SUPPORT OUR MISSION TO RESCUE AND SAVE LIVES EARLY REGISTATION $35 / […]

  • Elevation Everest

    Winter Park Resort 85 Parsenn Rd, Winter Park, CO, United States

    Elevation Everest is a race series held at Winter Park Resort in Colorado that offers hiking/trail running events centered around one goal: elevation gain. Choose to race solo or make […]

  • Outlast Colorado Springs

    Norris Penrose Event Center 1045 Lower Gold Camp Rd, Colorado Springs, 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. […]

  • Desert’s Edge Triathlon

    Highline Lake State Park 1800 11 8/10 Rd, Fruita, CO, United States

    JOIN US AT THE EDGE OF THE DESERT IN WESTERN COLORADO FOR THE 2026 DESERT'S EDGE TRIATHLON SERIES    ​sprint, Olympic, Collegiate draft legal, and Off-Road sprint RACES

  • Estes Epic

    Estes Park High School 1600 Manford Ave, Estes Park, CO, United States

    Join us for the Estes Epic — a premier event featuring a 50k Bike Race, 50k Run, and Heavy Half Marathon. After a six-year hiatus, this challenging race returns, offering […]

  • Run for the Angels 5K

    Rocky Mountain Metro Airport 11001 Control Tower Road, Broomfield, CO, United States

    If you've ever wanted to run on an airport, this is your chance! Angel Flight West is proud to present the Run for the Angels 5k! Angel Flight West is […]

    $40

  • John Wayne True Grit Trail Half Marathon

    Red Cliffs Lodge Mile Post 14 Hwy 128, Moab, UT, United States

    The True Grit Run meanders through the forest at the base of the San Juan Mountain where True Grit was filmed. The courses run on single track trails and fire […]

  • HRCA Oktoberfest 5K

    Highlands Ranch Race Series
    Highlands Ranch Town Center 9352 Dorchester St., Highlands Ranch, CO, United States

    Put on your lederhosen and sneakers as we kick-start the annual Highlands Ranch Community Association's Oktoberfest event in Town Center with the Oktoberfest 5K! This course is a mixture of […]

  • Mountain Marmot Trail Run

    Purgatory Resort 1 Skier Place, Durango, CO, United States

    Have you ever stood at the bottom of a mountain, staring up at the top, thinking to yourself: “I wonder if I could run all the way up there?” Well, […]

  • Colorado Brain Tumor 5K

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

    The Colorado brain tumor community will come together for a 5K Walk/Run to raise awareness and funds to support the needs of patients with brain tumors and their families.

  • Oktoberfest 5K

    Colorado Brewery Running Series
    Prost Brewing Company - Northglenn 351 West 104th Avenue Unit A, Northglenn, CO, United States

    Join us for The Oktoberfest 5k at Prost Brewing on September 26, 2026, for a 5k run event that starts and ends at this awesome taproom in Northglenn. Run, walk, […]

  • Oktoberfest 5K Trail Run

    Riverwalk Center 150 W Adams Ave, Breckenridge, CO, United States

    The Oktoberfest 5K returns this fall offering an active start to a festive weekend. Lace up your running shoes and experience the changing aspens and beautiful scenery in this 5K […]

  • Deep Creek Trail Half Marathon

    Telluride Airport Telluride, CO, United States

    This spectacular trail run will start at the beginning of Last Dollar Road by the Telluride Airport. Racers will make their way down Last Dollar Road to the Deep Creek […]

    • Please click here to submit your event for FREE to our online calendar.
    We do not allow events without physical locations (IE – virtual runs, runs with locations TBD, etc…).
    Please allow 48 hours after submission for an event to appear on the calendar. If you have already listed your event and would like us to update it, please contact us.

    Views: 0