Trail Running calendar near Boulder 2024-2025

The Samson's Revenge trail run takes place on May 18, 2024, in Estes Park, CO, offering race distances of 55k, 27k, and 10k. The course features a 10k loop with 1,200ft of gain per loop, including the challenging Bible Point ascent. Runners will traverse fast single track trails with a significant s..

The Endure Trail Runs @ Mueller State Park offers various events including a 10k, Half Marathon, 12-Hour, and 24-Hour races. The unique 12-Hour event involves runners pulling colored balls to determine their next loop, while the 24-Hour event requires participants to endure the full 24 hours. The Ha..

The Leadville Turquoise Lake 20K trail run takes place in Leadville, CO, offering stunning mountain views as participants run around Turquoise Lake. The course includes 6.5 miles of hilly paved road and 5.5 miles of single track dirt trail. The event starts at 9:00 AM at Matchless Boat Ramp, with bi..

The Great Divide Ultra is a trail running festival taking place in Divide, CO on June 1-2, 2024. The event offers a variety of distances including 100 miles, 100k, 50k, and 25k on both Saturday and Sunday. Participants will enjoy running on smooth single/double-track trails through Mueller State Par..

The Mountain Ridge Trail Race will take place in Highlands Ranch on Saturday 1 June 2024. You can run between 5 and 21 miles.

The Latino Ultra Nature Adventure will take place in Golden on Saturday 1 June 2024. You can run between 5 and 50 kilometers.

The North Fork 50 Mile/50K trail run takes place in the Buffalo Creek Recreation Area in the Pike National Forest, Colorado. The race offers a challenging course with varying altitudes between 6,700 to 8,600 feet for the 50 Mile and 50K distances. Participants can enjoy beautiful pine forests, uniqu..

The Crazy Legs 10K+ Trail Run will take place in Loveland on Sunday 2 June 2024. You can run between 0 and 0 kilometers.

The Fish Hatchery 5K Trail Run takes place at the historic Leadville National Fish Hatchery in Leadville, CO. The scenic cross country course winds through subalpine forest near Evergreen Lakes and lower Rock Creek area, consisting of dirt road, path, and trail. Participants can pick up their bibs a..

The adidas Terrex Après 5K Trail Run is a great way to kick off the GoPro Mountain Games weekend with an evening run on the trails of Vail Mountain. The event takes place on Friday, June 7 at 5:30 PM, starting at Nature Valley Mountain Plaza. The 5K course offers a moderate challenge suitable for ac..

The adidas Terrex 10K Spring Runoff is a challenging trail run taking place on Sunday, June 9th at almost 9,000 feet in the Vail Valley. Participants will compete for a cash purse on a course with constant elevation changes and mountainous terrain. The race features various age and gender categories..

The Ol' College Try 24 Hour Ultra is an inaugural race taking place at the Auraria Campus Tivoli Quad in Denver, CO. The event offers 6, 12, and 24-hour tiers, providing options for participants to test their limits. The race aims to make ultra racing more accessible to newcomers while raising funds..

Ring the Springs is an epic trail run event held at Rock Ledge Ranch at Garden of the Gods in Colorado Springs, offering distances of 100 miles, 100K, 50K, and 25K. The 100-miler course includes strenuous mountain climbing and a city-wide tour through the best parks and open spaces in the area, with..

The Dynafit Summer Solstice Trail Run is a popular race in the Vail Trail Running Series, taking place on June 22, 2024, at Beaver Creek, Colorado. The event offers both a 10K and 5K race, starting and finishing in front of the Beaver Creek Chophouse. Participants will enjoy stunning alpine views an..

The Sunset Trail Running Festival in Gold Hill, CO, offers a variety of trail races including a 28K, 12K, 5K, and Kids 1K, with varying registration fees and start times. The event takes place on June 23rd and benefits the Boulder Watershed Collective. Runners will experience scenic views of Boulder..

The Timberview Trail Run is a popular trail race held at Lory State Park in Colorado. The event offers three distances - 10 miles, 5 miles, and a 5K, suitable for athletes of all levels and ages. Participants can enjoy scenic views of Horsetooth Reservoir, Fort Collins, and the foothills while runni..

The Leadville Trail Marathon and Heavy Half is known as the nation's toughest and highest marathon, taking runners through challenging trails to Mosquito Pass at 13,185 feet. The event features a rolling start, chip timing, and various pace categories for both distances. The courses offer stunning v..

The Leadville Firecracker 5K is a Fourth of July event taking place in Leadville, CO, North America's highest incorporated city. Participants can walk or run the 5K course starting and finishing in downtown Leadville, above 10,000 feet. The event includes a Fourth of July parade and awards ceremony,..

The Leadville Silver Rush 50M will take place in Leadville on Saturday 6 July 2024. You can run between 15 and 50 kilometers.

The Dynafit Vail HillClimb is a challenging trail race that starts in Vail Village and finishes at Mid-Vail, covering a distance of 7 miles with an ascent of over 2,200 vertical feet. The race, scheduled for July 6, 2024, has been named the best trail race by Colorado Runner Magazine in the past. Pa..