Trail Running calendar near Morrison 2025-2026

The Ol' College Try 24 Hour Ultra is Denver's inaugural 24-hour ultra race, organized by Rise Again Running Events in collaboration with Tall Tales Ranch. Scheduled for May 24-25, 2025, at Auraria Campus, this event invites runners of all abilities to challenge themselves and achieve personal bests..

The Spirit Trail Race is an exciting running event held in Buena Vista, Colorado, during Memorial Day Weekend. Participants can choose from various race distances, including a marathon, half-marathon, and 9k. The race promotes community engagement by donating proceeds to local organizations such as..

The Leadville Turquoise Lake 20K is a scenic running event set in Leadville, Colorado, featuring breathtaking mountain views as participants race around Turquoise Lake. The course includes 6.5 miles of hilly paved roads followed by 5.5 miles of single-track dirt trails. Proceeds from the event suppo..

The Reuter-Hess Trail Run is a unique running event held in Parker, Colorado, featuring a challenging 10k course and a 1-mile kids' race. The race is designed with staggered starts based on age and gender, allowing participants of all ages a fair chance to compete. The course includes a mix of smoot..

The North Fork 50 Mile/50K is an ultramarathon held in the scenic Colorado mountains near Denver. This event features a challenging course that is entirely on soft surfaces, primarily consisting of singletrack trails, with some sections of double track. Runners will experience diverse landscapes, in..

The Fish Hatchery 5K Trail Run is an exciting running event set in the picturesque surroundings of the Leadville National Fish Hatchery in Colorado. Participants will enjoy a scenic cross-country course that meanders through subalpine forests and alongside the Evergreen Lakes and lower Rock Creek ar..

The Crazy Legs 10k+ Trail Run is an exciting running event taking place at Devil’s Backbone Open Space in Loveland, Colorado, on June 1, 2025. This trail run features a challenging course designed to provide a fun experience for participants. Runners will navigate through various trails, with water..

The adidas Terrex Après 5K Trail Run is an exciting event that kicks off the GoPro Mountain Games weekend in Vail, Colorado. Participants can enjoy a scenic evening run on the trails of Vail Mountain, starting and finishing at Nature Valley Mountain Plaza. This 5K race is designed for those looking..

The Great Divide Ultra is a premier trail running event taking place on June 7-8, 2025, in Divide, Colorado. This festival features a variety of race distances, including 100-mile, 100K, 50K, and 25K options, all set against the stunning backdrop of Mueller State Park. Participants will enjoy smooth..

The Garden of the Gods Ten Mile Run® is a premier running event in Colorado Springs, celebrated for its stunning course that winds through the iconic 300-foot sandstone rock formations of Garden of the Gods Park. This challenging race, which has been a local favorite for over 45 years, features a 10..

The adidas Terrex 10K Spring Runoff is an exhilarating trail running event set in the stunning Vail Valley, taking place at an elevation of nearly 9,000 feet. Participants will face a challenging course featuring constant elevation changes and diverse terrain, competing against top trail runners for..

The Summits Trail Runs, part of the Human Potential Running Series, is an exciting trail running event set in the stunning Rocky Mountains at Granby Ranch Resort, Colorado. Scheduled for June 14, 2025, the event features multiple race distances, including a challenging 43-mile Quad, a 27-mile Triple..

The Barr Lake Trail Race, held at Barr Lake State Park in Brighton, Colorado, is a popular running event featuring multiple distances: 50K, 30K, Half Marathon, 15K, and 5K. Celebrating its sixth year, the race showcases one of Colorado's flattest and fastest courses, with less than 100 feet of eleva..

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 creates an exciting challenge, as there is no predeter..

Ring the Springs is an exciting trail running event taking place in Colorado Springs, Colorado, on June 21, 2025. This fourth edition offers participants a choice of three challenging distances: 100K, 50K, and 30K, each showcasing the stunning natural beauty of the area. Runners will navigate throug..

The Timberview Trail Run is a scenic trail running event held at Lory State Park in Colorado, featuring three race distances: 5K, 5 miles, and 10 miles. Scheduled for June 28, 2025, this event caters to athletes of all levels, including beginners and families, with a beginner-friendly 5K route. Part..

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 an..

The Vail Hillclimb will take place in Vail on Saturday 5 July 2025.

The Alma Foundation Race in the Clouds Dirt Festival is an exciting outdoor event taking place in Alma, Colorado, from July 10 to July 13, 2025. Set at an elevation of 10,600 feet, the festival features a variety of activities including mountain bike racing, trail running, a free kids' bike race, an..

Chase the Moon is a unique 12-hour endurance running event held overnight in the scenic Highlands Ranch Backcountry trail system. Participants can choose to run solo or form teams of 3 or 5 for a relay. The race begins at sunset and continues under the full moon, concluding at sunrise, offering brea..