Trail Running Calendar Colorado 2025-2026

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 distances: a 50K, a marathon (approximately 26.7 miles), and an 8-mile run. The courses traverse historic m..

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 takes place on the picturesque Spring Creek trail, surrounded by wildflowers and Aspen trees, and includes challenging terrain with significant eleva..

The 10K & 5K @ 10,000 Feet is a thrilling running event organized by the Vail Recreation District, set against the stunning backdrop of the Vail mountains. Participants can choose between a 10K or 5K race, both designed to challenge runners while offering breathtaking views of the surrounding landsc..

The Barr Trail Mountain Race is a renowned summer mountain running event held in Manitou Springs, Colorado. Covering a challenging 12.6-mile course, participants start at the Cog Railway Station, ascend the iconic Barr Trail to Barr Camp, and then descend back to the Barr Trailhead. This race, estab..

The Kendall Mountain Run, taking place in Silverton, Colorado, features a challenging 12-mile and an 11K race that culminates in a thrilling ascent to the summit of Kendall Mountain at 13,066 feet. Participants will experience breathtaking views of the San Juan Mountains as they climb from 9,318 fee..

The Never Summer 100km and 60km races will take place from July 25-27, 2025, in the stunning landscapes of State Forest State Park, Colorado. This challenging mountain race features a variety of terrains, including high alpine ridges, meadows, and rocky trails, with participants experiencing breatht..

The Pikes Peak Ultra is an exciting running event that showcases the stunning trails of Colorado Springs. Established in 2015 by Mad Moose Events, the race begins at Bear Creek Regional Park and features a challenging course that includes the iconic Seven Bridges Trail and Pipeline Trail. Participan..

The Creede 100 is an exhilarating 100-mile ultramarathon set in the historic mining town of Creede, Colorado. With only 100 spots available, this challenging race offers participants breathtaking views of the San Juan Mountains, including climbs above 12,000 feet and scenic trails along the Continen..

Grand Mesa Ultras is an exciting mountain running event held in Grand Mesa, Colorado, featuring races of 50 miles, 55K, and 30K. Set on the world's largest flat-topped mountain, participants can expect challenging trails with rocky climbs, flowing single tracks, and stunning alpine scenery. The even..

The Box Canyon Trail Races, set in the stunning high country of Telluride, Colorado, features two challenging courses: a 30K and a 10-mile race. The 30K route offers a scenic loop with significant elevation gain, taking runners past iconic landmarks and through alpine meadows, culminating at the Tel..

The Summit 200 is an extraordinary 200-mile mountain race set in Summit County, Colorado, featuring a challenging loop that showcases stunning natural beauty. Runners will navigate a mix of hiking trails, forest roads, and paved sections, with elevations ranging from over 9,000 to nearly 13,000 feet..

The Boulder Rez Marathon is a scenic running event held at the Boulder Reservoir in Colorado, featuring a flat course primarily on dirt roads and trails. Participants can choose from various distances, including a marathon, half marathon, 3/4 marathon, and 10K. The race offers stunning views of the..

The Berry Picker Trail Run will take place in Vail on Saturday 2 August 2025.

The Sheep Mountain Ultras, part of the Human Potential Running Series, is an annual trail running event held in Fairplay, Colorado. Scheduled for August 2, 2025, it features three race distances: a challenging 50-mile, a 50k, and a half marathon, all set against the stunning backdrop of the South Pa..

The Emerald Mountain Epic is a premier two-day endurance event held in Steamboat Springs, featuring both mountain biking and trail running races. Known for its challenging courses, the event includes 90% singletrack trails with significant elevation gains, attracting participants of all skill levels..

The Kennebec Mountain Run is a challenging 15-mile trail race set in the picturesque La Plata Mountains of southwest Colorado. Participants will navigate a rugged course featuring a significant elevation gain of 3,100 feet, reaching a peak of 12,200 feet at Kennebec Pass. The event promises breathta..

The TransRockies Run is an exhilarating six-day stage race set in the stunning Colorado Rockies, covering a total distance of 120 miles. Scheduled for August 4-9, 2025, this event promises an unforgettable adventure for participants, fostering a unique community spirit among runners. The race is des..

The Lory Summer Trail Series, taking place from August 5 to August 26, 2025, offers a series of midweek trail races designed for both novice and experienced runners. Participants can choose from distances of 5K, 10K, and 12K, with courses that vary in elevation gain. The event aims to create a fun a..

The Eltuck Valley 5K is part of a series of midweek trail races held at Lory State Park in Bellvue, Colorado. Scheduled for August 5, 2025, this event is designed to cater to both novice and experienced runners, offering a flat and fast course ideal for those looking to improve their speed. Particip..

The High Five 100 is a unique ultra-running challenge held in Lake City, CO, designed for elite runners seeking an extraordinary test of endurance. Participants must navigate a course that includes 24 designated proof points and checkpoints, with the goal of returning to Lake City within a 48-hour t..