Trail Running calendar near Larkspur 2026-2027

A looped trail ultrafestival in Mueller State Park on June 6 to 7 2026 offering 100 mile, 100k, 50k and 25k races on smooth single and double track. Aid stations are crew accessible and a night run takes place at sunset.

Aiden's Adventure 5k is a community run/walk honoring a young child's memory. The event features a flat dirt trail 5k, a kids' dash, and family-friendly activities like carnival games and a butterfly release. All proceeds support local char..

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.

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.

Races through Garden of the Gods Park include a 10 mile road, 10K road and 10K trail, all finishing at Rock Ledge Ranch. The routes pass towering sandstone formations, include aid stations, and end with on-site post-race food and music.

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.

A trail race at Garden of the Gods on June 20, 2026, offering 100K, 50K, and 35K courses that feature significant climbing, multiple aid stations, and a start/finish at Rock Ledge Ranch in Colorado Springs.

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.

Test your strength at this exclusive obstacle course event in Peyton featuring a three lap 3K race and a one mile kids run. Navigate rigs, rope climbs, and heavy carries in a small field of only fifty athletes.

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.

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.

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..

A professional pack burro race in Cripple Creek during Donkey Derby Days, featuring a 6 mile urban course, chip timing, checkpoint support, animal welfare rules, on-site activities and monetary awards.

Celebrate Independence Day with a festive 5k along Pueblo's Arkansas River Trail. This family-friendly event features costume prizes, finisher medals, and post-race activities. Proceeds support the local running community and charitable cau..