Trail Running Calendar Colorado 2024-2025

The Howelsen Hill Trail Run is an exciting trail running event set in the scenic surroundings of Howelsen Hill in Steamboat Springs, Colorado. Scheduled for June 14, 2025, participants can choose between two challenging distances: an 8-mile and a 4-mile run. The event showcases the beautiful trails ..

Estes Park's Backyard Ultra is a unique ultra-running event set against the stunning backdrop of Lake Estes, Colorado. Participants must complete a 4.252-mile loop every hour until only one runner remains, who is declared the winner. This format emphasizes endurance and strategy, as there is no pred..

The San Juan Solstice 50 Mile Run is an annual ultra-marathon held in Lake City, Colorado, typically around the Summer Solstice. Established in 1995, the event has evolved into a community benefit for local EMTs. The race features a challenging course that includes high mountain terrain and varying ..

The Leadville Trail Marathon and Heavy Half is a challenging running event set in the historic mining district of Leadville, Colorado. Participants can choose between a 26.4-mile marathon or a 15.4-mile Heavy Half, both featuring rugged trails and high-altitude terrain, with the marathon reaching Mo..

The Timberview Trail Run is an exciting annual event held at Lory State Park in Colorado, featuring three race distances: a 10-mile, a 5-mile, and a 5K trail run. Scheduled for June 28, 2025, this event welcomes participants of all ages and skill levels, making it ideal for beginners and seasoned ru..

The Hahns Peak Vertical Trail Race is an exhilarating 8-mile out-and-back trail run set in Clark, Colorado. Participants will ascend 4 miles to the summit of Hahns Peak, reaching a historic fire lookout tower built in 1912, before returning to the starting point. The course features a challenging mi..

The Alma Foundation Race in the Clouds Dirt Festival, taking place in Alma, Colorado, offers a thrilling weekend of outdoor activities from July 10 to July 13, 2025. Participants can enjoy a variety of events, including mountain bike races, trail running, a free kids' bike race, and an off-road duat..

Chase the Moon is an exciting 12-hour endurance running event held in the Highlands Ranch Backcountry trail system. Participants can choose to run solo or form teams of three or five for a relay. The race takes place overnight, starting at sunset and continuing under the full moon, offering stunning..

The Silverheels Trail Runs, part of the Human Potential Running Series, is an annual event taking place in Como, Colorado, featuring a variety of challenging distances including 10-Mile, 19-Mile, 60k, 50-Mile, 100k, and 100-Mile races. Set at an average elevation of over 10,000 feet, the course offe..

The Hardrock 100 is a challenging 100-mile ultramarathon held in the San Juan Mountains of Colorado. Participants face a total elevation change of 66,394 feet, with an average elevation of over 11,000 feet, making it one of the toughest endurance runs in the world. The course features a mix of 4WD r..

The Leadville Silver Rush 50M is a challenging 50-mile trail run set against the stunning backdrop of the Rocky Mountains. Participants will navigate a course featuring 8,000 feet of elevation gain, technical climbs, and exhilarating descents, making it a true test of endurance and grit. The event s..

The High Lonesome 100 is a challenging 100-mile trail race set in the stunning Sawatch Range of Colorado. With a total elevation gain of 23,500 feet and a high point of 13,150 feet, this race offers a rigorous loop course that includes sections of the National Scenic Continental Divide Trail and the..

The Ouray 100 Mile Endurance Run is a challenging ultramarathon set in the breathtaking San Juan Mountain range of Colorado. Participants face approximately 41,862 feet of elevation gain, making it one of the toughest endurance events. The race features stunning views and demanding climbs, culminati..

The Spring Creek Memorial Trail Run is a scenic running event held in Steamboat Springs, Colorado, featuring a 9.5-mile loop and a 5K course. The race honors Patty Brenner Hagberg, who tragically lost her life on the trail in 1991, emphasizing the importance of sharing multi-purpose trails. Particip..

The Powderhorn Mountain Ultra and Vert Challenge is an exhilarating endurance event set for July 19, 2025, at Powderhorn Mountain Resort in Mesa, Colorado. Participants can choose between a 12-hour or 6-hour race, tackling a challenging 10K loop with significant elevation gain, or focusing on vertic..

The Silverton Alpine Marathons, taking place in Silverton, Colorado, offers an exhilarating trail running experience through the stunning San Juan Mountains. Participants can choose from three race distances: a 50K, a marathon, or an 8-mile run, all set against a backdrop of historic mining ghost to..

The Kendall Mountain Run, taking place in Silverton, Colorado, features a challenging 12-mile and 11K race that ascends to the summit of Kendall Mountain, reaching an elevation of 13,066 feet. Participants will experience a thrilling climb along jeep roads, culminating in a vertical scramble to the ..

The Never Summer 100Km and 60Km races are set to take place from July 25-27, 2025, in the stunning landscapes of State Forest State Park, Colorado. Participants can choose between a challenging 100Km course with approximately 14,450 feet of elevation gain or a 60Km option with around 8,850 feet of e..

Grand Mesa Ultras is an exciting mountain running event taking place in Grand Mesa, Colorado, known for its stunning trails and breathtaking views. Participants can choose from three race distances: 50 Miler, 55K, and 30K, all set against the backdrop of the world's largest flat-topped mountain, wit..

The Creede 100 is an exhilarating 100-mile ultramarathon set in the historic mining town of Creede, Colorado. Scheduled for July 26, 2025, this challenging race offers participants breathtaking views of the San Juan Mountains, with elevations exceeding 12,000 feet. The course features pristine singl..