Trail Running calendar near Evergreen 2025-2026

Niwot's Challenge is a demanding ultramarathon held in Colorado's Front Range, inspired by the Barkley Marathons. This grassroots event, limited to 40 participants, emphasizes navigation skills as runners traverse mostly off-trail terrain using only a map and compass. The challenge includes various..

The Mountain Ridge Trail Race, held in Highlands Ranch, Colorado, offers scenic trail running options for all levels, including 5K, 10K, half marathon, and 21-mile courses. Set on the Douglas County East-West Regional Trail, the race features rolling hills, dirt and single-track trails, and manageab..

The Quad Rock 50 & 25 Mile Trail Races, held at Lory State Park and Horsetooth Mountain Park near Fort Collins, Colorado, offer challenging and scenic trail running experiences. Participants can choose between a 25-mile loop with 5,500 feet of elevation gain or a 50-mile race that doubles the distan..

The Valkyrie Trail Race, held in Cheyenne Mountain State Park near Colorado Springs, Colorado, is a women-focused trail running event offering distances from 4 miles up to 50 kilometers. The course begins on crushed limestone meadows before transitioning to singletrack trails ascending Cheyenne Moun..

Ram Party Trail Runs is a vibrant trail running event held at the Buffalo Lodge Bicycle Resort in Colorado Springs, Colorado, centered around the scenic Rampart Reservoir and Rampart Range Road. The event offers multiple race distances including 55 miles, 60K, 50K, 24K, and 15K, catering to a wide r..

The Endure Trail Runs, organized by the Human Potential Running Series, takes place at Mueller State Park in Divide, Colorado. This unique event features a variety of races, including a 10k, Half Marathon, and timed challenges of 12 and 24 hours. Participants in the 12-Hour and 24-Hour events will d..

Samson's Revenge is a trail running event held at the YMCA of the Rockies in Estes Park, Colorado, honoring Samson, the famous elk of the Rockies. The race offers three distances: 10K, 27K, and 55K, featuring fast single-track trails with significant elevation gain, including a challenging ascent of..

The Weld Your Mettle Running Festival is a four-day event taking place in Eaton, Colorado, from May 23 to May 26, 2025. It offers a variety of running challenges suitable for all levels, including a 7K run, ruck, and timed events ranging from 3 to 48 hours, either solo or as part of a relay team. Pa..

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 in a non-stop race, fosteri..

The Spirit Trail Race is a running event held in Buena Vista during Memorial Day Weekend, featuring a marathon, half-marathon, and 9K race. Participants start at the South Main Town Square area, with race times beginning early in the morning. The event supports local organizations such as the Buena..

The 3rd Latino Ultra Nature Adventure (LUNA) is a unique trail running event scheduled for May 31, 2025, in Boulder, Colorado. This culturally relevant and inclusive event features various distances, including 5km, 7 miles, 15 miles, and a marathon. LUNA aims to promote physical and mental health th..

The Leadville Turquoise Lake 20K is a scenic running event set around the picturesque Turquoise Lake in Leadville, Colorado. Participants will experience breathtaking mountain views as they navigate a course that combines 6.5 miles of hilly paved roads with 5.5 miles of single-track dirt trails. The..

The Luna (Latino Ultra Nature Adventure) is an inclusive, culturally relevant ultra running event held in Boulder, Colorado. Now in its third year, it offers various race distances, including 5km, 7 miles, 15 miles, and a marathon, all taking place on May 31, 2025. The event emphasizes human-nature..

The Reuter-Hess Trail Incline is a challenging 10k trail race held in Parker, Colorado, featuring about 600 feet of elevation gain. The course begins with a lollipop loop that includes a steep incline with widely spaced stairs, making running difficult. After the incline, runners navigate rolling te..

The North Fork 50 Mile and 50K ultramarathon takes place in the scenic Colorado mountains near Buffalo Creek. The course features nearly all singletrack trails, with some double track sections, traversing diverse landscapes including burn areas from a 1996 fire, ponderosa pines, and granite rock for..

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 takes place at Devil’s Backbone Open Space in Loveland, Colorado. The course features a scenic loop through Hidden Valley, Hunter Loop, Laughing Horse Loop, and Wild Loop trails, covering over 10 kilometers with minimal overlap to prevent congestion. Marked by flour arr..

The Vail Ultra Benefiting 50 For The Fallen is a 50-mile ultramarathon held in Vail, Colorado, starting at The Hangout at Golden Peak. This challenging mountain race offers participants a scenic and demanding course through the stunning terrain of Vail. The event supports the 50 For The Fallen organ..

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. The 5K course is designed to be accessible..

The Great Divide Ultra is a premier trail running festival held in Divide, Colorado, featuring distances of 100 miles, 100K, 50K, and 25K. Set in Mueller State Park, the course showcases stunning spring-fed meadows, massive Pikes Peak granite rocks, and sweeping mountain views. The looped course is..