Trail Running Calendar Colorado 2026-2027

Tackle a formidable 100-mile route with over 41,000 feet of climbing in Colorado's San Juan Mountains. This low-frills event requires volunteer service and awards cash prizes subject to drug testing. Finishers earn a distinctive belt buckle..

The High Lonesome 100 is a 101-mile mountain ultra through the Sawatch range. Runners traverse the Continental Divide, pass ghost towns, and climb over five alpine passes with 23,500 feet of total gain. This loop course offers a mix of sing..

Experience a high altitude trail adventure through Colorado's San Juan Mountains. Run past historic ghost towns and reach heights of over 12,900 feet on the scenic Alpine Loop.

Tackle the Stagecoach Trail at Powderhorn Mountain Resort. Choose between a steep 5K climb or a demanding 15K that goes up the mountain twice. The registration includes a lift pass, t-shirt, and post-race food.

Run through wildflowers and Aspens along Spring Creek in Steamboat Springs. Choose between a challenging 9.5-mile loop with significant climbing or a rolling 5K out-and-back. This memorial event includes a post-race meal.

Run scenic mountain trails around Aspen Snowmass at the Audi Power of Four Trail Run on July 18, 2026. Choose from 10K, 25K or an epic 50K and enjoy challenging terrain, alpine views and Audi supported race day energy.

Experience high altitude trail running at 10,000 feet on the scenic Vail Mountain in Colorado. Choose between a 5K or 10K course featuring mountain views, wildflowers, and a unique gondola ride to the starting line.

Experience a historic mountain run in Manitou Springs. This 12.6 mile course ascends Pikes Peak to an elevation of 10,200 feet before descending to the finish at the Barr Trailhead.

The TransRockies Run is a three-day stage race through the Colorado Rockies, from Hope Pass to Red Cliff. Choose between the 51-mile Full Pint or the 35-mile Half Pint. Runners finish each day at a fully supported camp with meals, showers,..

Experience a historic high altitude climb in Silverton Colorado featuring a 12 mile summit run and an 11 km course. Scale Kendall Mountain and take in views of the San Juan Mountains in this classic mountain tradition.

Event Details The Never Summer 100km & 60km is a mountain trail running event scheduled for July 24-26, 2026. It is organized by Gnar Runners. The races start and finish at the Gould Community Center in Gould, Colorado. The event takes..

The Pikes Peak Ultra on July 25, 2026, features trail races from 20K to 50 miles in Colorado Springs. Starting at Bear Creek Park, the course includes views of Pikes Peak and a summit of Mt. Rosa for longer distances. Organized by Mad Moose..

An ultra running event in Creede offering 50 mile and 100 mile courses across the San Isabel and Rio Grande National Forests over two days, organized by Tempest Adventures under a USDA Forest Service permit.

Grand Mesa Ultras This trail running event takes place on the Grand Mesa in Colorado, described as the world's largest flat-topped mountain, with an average elevation over 10,000 feet. The event offers three race distances: 50 Miler, 55K, a..

The Box Canyon Trail Races showcase the high alpine scenery of Telluride, Colorado. Runners can choose between a rugged 30K loop or a stunning 10 mile course, both featuring significant elevation gain. The event finishes in the historic tow..

Course and Terrain The Summit 200 is a 200-mile single-loop ultramarathon in Summit County, Colorado. The non-repetitive course utilizes hiking trails, 4WD roads, and recreation paths, with the majority being single-track trail and infreque..

Experience a 200 mile point to point team relay from Fort Collins to Steamboat Springs. Run through the heart of the Rocky Mountains and over two scenic mountain passes in this multi-day Colorado adventure.

Experience high altitude trail running at an average elevation of 10,600 feet in Fairplay, Colorado. Choose between a technical ultra marathon or a flowing half marathon through the scenic South Park Valley.

A 15 mile mountain trail race in Hesperus, Colorado, gaining about 3,100 feet and topping out near 12,200 feet at Kennebec Pass. This non profit event benefits La Plata County Search and Rescue and is limited to 150 runners.

Experience high alpine trail running in the scenic mountains surrounding Aspen. Choose between 50K, marathon, or heavy half marathon distances on dirt trails ending at a vibrant finish line festival.