Trail Running calendar near Nederland 2026-2027

Haul Ass Ultra at Luvin Arms in Erie, CO features multiple distance and timed events on a mostly flat off road loop with Rocky Mountain views and running past sanctuary animals; a portion of proceeds supports the sanctuary.

A looped 10k plus trail run at Devils Backbone Open Space in Loveland featuring marked singletrack, an aid station near mile three served twice, old school timing with a finish stick, and an awards gathering at Loveland Aleworks.

A mountain trail 10 km on Vail Mountain at nearly 9,000 feet with varied terrain, two on course aid stations and a cupless policy with a provided collapsible cup. Multiple age categories and a total prize purse of $12,200.

Looped trail races at Barr Lake State Park in Brighton Colorado offer 50K, 30K, half marathon, 15K and 5K options on dirt surfaces with lake and Front Range views. Aid station coverage varies by distance.

A trail race on the single track trails of Howelsen Hill in Steamboat Springs offering 8 mile and 4 mile distances. Proceeds support the Knights of Columbus and awards and a prize raffle follow the race.

A five-race series in Winter Park, Colorado, from June 14 to August 23, 2025, including two 10K races, a 5K, a half marathon and a full marathon. Series scoring uses FIS World Cup points and a weighted difficulty factor.

Prepare for the Race Across the Sky at this three day training camp in Leadville. Run key sections of the 100 mile course alongside veteran guides and attend educational panels on nutrition and biomechanics.

Experience up to three miles of messy fun at the Colorado National Speedway. Navigate obstacles by crawling wading and sliding through the mud with friends and family during this unique event in Dacono.

Trail 10K and 5K races in Beaver Creek on June 20, 2026 with a kids run, aid stations, post race food and age group awards. The event benefits the Vail Valley Charitable Fund.

Summer Vibes Bike Rally & Run Festival in Lyons Colorado pairs gravel and road bike rallies with trail running, relays, live music, recovery pools and camping for a combined endurance and festival weekend.

A multi-event Colorado series of four half marathons and a 25K across summer 2026, organized by HAL Sports with races run by local nonprofits. Participants may register for three, four, or all five events.

A community-focused trail festival in Gold Hill, Colorado, with 28K, 12K, 5K and Kids 1K races, a shuttle from Boulder, and proceeds supporting wildfire preparedness for the town.

Experience a high altitude outdoor festival in the highest incorporated town in North America featuring trail running mountain biking and duathlon. Enjoy a weekend of racing and meadow camping surrounded by 14,000 foot peaks.

Timberview Trail Run on June 27, 2026 at Lory State Park in Bellvue Colorado offers three trail distances: 5K, 5 mile and 10 mile. Courses run among treetops with views of Horsetooth Reservoir and Fort Collins.

On June 27, 2026 in Leadville, Colorado two trail races run to Mosquito Pass at 13,185 feet. The marathon is 26.4 miles and the Heavy Half is 15.46 miles, with multiple on-course aid stations and a Leadville Trail 100 qualifying allocation.

An overnight endurance event in Highlands Ranch, Colorado offering solo and team relay options on a 10.3 miles dirt loop beneath a full moon. Two aid stations, drop bags, medical support and a headlamp requirement are provided.

A backyard ultra on the paved Lake Estes trail where runners complete 4.252 mile loops each hour until one runner finishes a loop alone. The event records yards for DNFs and offers on-site aid and athlete village space.

A trail run at Howelsen Hill offering 5K and 10K options on single track trails, held alongside the SBT GRVL bike event. Awards and a post race celebration take place at Little Toots Park.

Experience a half marathon in the mountains of Nederland Colorado. This event features a significant elevation gain of 4226 feet with the summit always in view.

A 10K trail race at Alderfer Ranch that loops through Elk Meadow Open Space Park via Pioneer Trail, with a downhill along Highway 74 and a wooded section by the mountain. Registration is not yet available and the race is cup free with no ai..