High Lonesome 100
County Road 321 Nathrop, CO, United StatesThe High Lonesome 100 is a high flying endurance race in the Sawatch range of the Colorado Rocky Mountains. With 22,500' of vertical gain and reaching an elevation of 13,150', it's a hell of a course. The race runs in a loop through some of the most beautiful single track in the state, and takes runners on the Continental Divide and Colorado Trail, through 2 ghost towns, over 5 alpine passes, through remote basins, and over soaring ridges. This year's event takes place on July 30th.
Audi Power of Four Trail Race
Aspen Mountain 601 East Dean Street, Aspen, CO, United StatesThe Audi Power of Four Race Series is a premier endurance race series utilizing the unique and amazing terrain of each of the four Aspen Snowmass mountains. Each race is designed to test the limits and skills of both elite and recreational athletes. The event’s signature race is a challenging 50K Ultra is part of […]
Summer Splash Prairie Dog Half Marathon
Castle View High School 5254 N. Meadows Dr., Castle Rock, CO, United StatesWelcome to the Summer Splash Prairie Dog Half, 10k & 5k in Castle Rock, Colorado. Part of the Prairie Dog Half race series, join us in July as we race through Castle Rock along the East Plum Creek Trail.
Summer Sizzler 5K/10K/15K
America the Beautiful Park Cimino Dr, Colorado Springs, CO, United StatesJoin us on July 15th, 2023 for the annual Summer Sizzler, featuring the amazing scenery of America the Beautiful Park! Whether you are looking to run, walk or just enjoy the race SWAG this race is a sure thing for a great time and an incredible experience! This is a fun, family event for all […]
Heritage Eagles 5K
Heritage High School 1401 W Geddes Ave, Littleton, CO, United StatesSupport the Heritage Eagles cross country team at the annual Heritage Eagles 5K. Last year's race, raised over $3,500 for the Heritage Eagles xc team; $ 10.00 of every registration goes right back to supporting the team. New this year, all-you-can-eat pancake breakfast provided by Flippin' Flapjacks. The Liberty Bell Cross Country Invitational has been […]
Vail 10K and 5K @10,000 Feet
Vail Village 292 E Meadow Dr, Vail, CO, United StatesBoth Dynafit 5K and 10K races, presented by Summit Ford, will begin at 8 a.m. at the top of Gondola One at Mid-Vail on Vail Mountain, with the entire race taking place above 9,000 feet. The average grade of the 10K is 7 percent with an elevation gain of nearly 1,200 feet, while the shorter […]
Spring Creek Memorial Trail Run
Spring Creek Trailhead Steamboat Springs, CO, United StatesThis race is held in memory of Patty Brenner Hagberg who was struck and killed by a truck along the lower part of the trail in 1991. This race should remind all of us the importance of sharing multi-purpose use trails. The race is held on the beautiful Spring Creek trail with wildflowers and Aspen […]
Canceled Fox on the Run Trail Races
Turkey Springs Guard Station US Forest Service Road 629, Pagosa Springs, CO, United StatesThe Fox on the Run is a 10 mile and 5 mile trail race that starts and finishes near the Turkey Springs Guard Station in Pagosa Springs, CO. This 5 mile and 10 mile trail race takes place on July 16th.
Pioneer Days 5K
Jack Dempsey Park 412 Main St, Manassa, CO, United StatesCome join 500 of your running friends for southern Colorado's oldest and perhaps largest road race. This 5K starts and ends near Jack Dempsey Park. After the race, stick around for the great Pioneer Days parade and a day's worth of fun!
Respect Life 5K
Light of the World Catholic Church 10316 W Bowels Ave, Littleton, CO, United StatesThe race is the same as last year, including the new course (the path was repaved and widened!). You can participate as a runner, walker, donator, or volunteer. 5K runners and walkers can register as an individual or as a member of a team in one of two team categories, Knights of Columbus or Parish/Organization. […]
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.