Trail Running calendar near Longmont 2026-2027

Chase the Moon is an overnight fixed time trail event in Highlands Ranch, Colorado with solo 12, 6 and 3 hour races, a 50K and three and five person relays. Runners complete marked loops on dirt trails with aid stations and drop bag support..

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.

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 5k trail race at Alderfer Ranch in Evergreen, CO with a course through Alderfer/3 Sisters Park. Shuttle service runs from Wulf Rec Center and on-site vendors, games, and food are available. Internet registration is not yet open.

A 5K run/walk in Winter Park, Colorado following the Fraser River Trail from Gondola Plaza to the Rendezvous Event Center, with an after party featuring refreshments, awards and prize giveaways.

A historic uphill trail race on Vail Mountain covering about 12.2K (7.6 miles) with 2,128 ft of gain, three aid stations, on-course hydration and a Mid-Vail finish with awards by age group.

Experience high altitude trail running through historic Colorado ghost towns and mines at over 10000 feet. Choose from distances ranging from 10 miles to 100 miles in the scenic South Park Valley.

Experience the STRS Horseshoe Gulch Grind in Breckenridge with short and long course options. This trail event offers categories for adults and youth starting from the Blair Witch Trailhead.

High-altitude trail races on Vail Mountain offering 10K and 5K courses that start near Gondola One, feature singletrack and gravel sections, on-course aid stations, post-race refreshments, and age-group awards.

Repeating 2 km out and back laps on the Thumb Open Space trail in Estes Park. Participants collect a poker chip at each turnaround and the most chips wins during a sunup to sundown timeframe; 35 spots and a $100 entry fee.

A community trail event at Ranch Camp with organized 5k and 10k courses, water stations, medical support, sliding-scale registration, and post-race tie-dye and crafts for finishers.

Experience a true mountain ultra through the rugged alpine peaks and lakes of Northern Colorado. Navigate technical trails and high ridges across 60km or 100km courses in a wild wilderness setting.

A 10 mile trail race at Staunton State Park on July 25, 2026 with no aid stations on course, a cup free policy, and on site vendor tents and recreational activities for spectators.

A mountain fundraiser in Conifer, Colorado on July 25, 2026 featuring a 10K, a USATF certified 5K, and a 2 mile fun run, followed by a street festival with live music, vendors, and family activities.

A single 200 mile loop around Summit County, Colorado, running above 9,000 feet with roughly 40,000 feet of climbing. Field capped at 75 runners, live GPS tracking provided, and a multi tier deferral policy with no refunds.

STRS #4 - Tom's Baby on July 29, 2026 takes place at Tom's Baby Trailhead in Breckenridge, CO, offering short and long course entries with adult, youth, and non-binary categories and published entry fees.

A point to point relay across Colorado, the Wild West Relay covers 200 miles and 36 legs from Fort Collins to Steamboat Springs over two mountain passes. Teams of various sizes can compete and each team carries a GPS tracker with app suppor..

High-alpine trail races in Winter Park, Colorado, with 50K, 21K and 10K routes that run on mostly singletrack and finish in town amid mountain scenery and community amenities.

A mountain trail race in Vail on August 1, 2026 featuring an uphill 6.9 km course with about 2,013 feet of gain, singletrack and doubletrack terrain, an aid station, post race refreshments, awards and a raffle.

Two Brothers Up and Down in Idaho Springs offers two uphill out and back races on mixed dirt and paved roads, with steep sections and an aid station on the 10k. Both races start and finish at Courtney Riley Cooper Park.