1876 Centennial Run 18.76K

Snowmass Tree-O: 1876 Centennial Edition

Snowmass Tree-O is a two day, untimed trail event produced by the Colorado Brewery Running Series at the New Belgium Ranger Station in Snowmass Village, CO on August 7 and 8, 2026. The event offers multiple short trail runs and an overall 18.76k Centennial Challenge for those who complete all three distances between Friday and Saturday.

Distances offered:

• 3.76k
• 5k
• 10k

The 3.76k and 5k are offered on both Friday evening and Saturday morning. The 10k is offered only on Saturday morning. Courses start and finish at the brewery and use single track bike trails, ski slopes, and mountain access roads. The course is open to walkers, runners, joggers, and hikers and is an open course with roads not closed to traffic; participants must obey traffic laws. Volunteers and course markings will be present at major turns and at one road crossing on each of the 5k and 10k courses. Water stations and bathrooms are provided on the 5k and 10k courses only.

Included items and features: one free craft brew at the finish, an 1876 Centennial Run bib and finisher medal, the chance to earn the 18.76k Challenge medal piece, live music, food from New Belgium Ranger Station, local vendors, door prizes, event merchandise, and an optional commemorative t shirt. Children under 12 run free, dogs are welcome, there is public parking, no bag check, and events run rain or shine. A portion of proceeds supports local nonprofits. Refunds are allowed up to seven days before the event. Visit the organization's website for the most recent information.