Aspen Logo

Treeline Trial Challenge Course

One of the main features of the Lost Forest, Treeline Trial Challenge Course, combines rappels, ziplines, bridges, and ladders for a thrilling obstacle course in the trees. Learn to trust your instincts, conquer your fears, and surprise yourself.

The Treeline Trial ropes course at Snowmass

Summer 2024 Operating Dates

Open: Daily: June 21–Sept. 2; Weekends (Fri.–Sun.) Sept. 6-8, 13-15, 20-22, 27-29

Close: Sept. 29

Open to families and thrill-seekers, the course redefines the summer on-mountain experience at Snowmass. Choose from five different courses of varying difficulty: Lily Pads (easiest), Snakes & Ladders, Eagle Walk, Spider Web and Islands in the Sky (most difficult).

Book now

Planning Information

Allow a minimum of 2 hours to experience the Challenge Course including orientation. Participation in the Challenge Course requires completion of an orientation session which run every 30 minutes at :00 and :30 past the hour, starting at 10:00am and ending at 1:00pm. Guests must select the date and time for their orientation at the time of purchase. There is a maximum of 10 participants per orientation session (10 at 10:00am, 9 for every other session). Guests should plan to arrive at Snowmass Base Village to check-in at the base of the gondola at their start time, or earlier to experience the other activities prior to Treeline Trial. The last opportunity to begin a course is 4:00pm for the easiest two courses and 3:45pm for three more difficult courses.

Returning guests also need to select the date and time to begin their session at the time of purchase, but only need to go through orientation once per summer.

Please review our Lost Forest Rules & Regulations before purchasing admission.

Know Before You Go

Treeline Trial Rules

Allow a minimum of 2 hours to experience the Challenge Course including orientation. Guests must be 12+ years old or accompanied by an adult.


Only closed toe shoes and boots are allowed on the Canopy Run Zipline Tour. No sandals or flip-flops.


Wear longer shorts, pants or leggings (for more comfort with the harness). Short-sleeved and long-sleeved shirts are also more comfortable than tanktops due to the harness. Take off all necklaces and large jewelry before arriving at Snowmass.


If you bring your phone, store it in a securely zipped pocket. Should you drop your phone along the way, the guides will not be able to retrieve it.


Leave backpacks and extra items in the bin provided. Your harness needs to fit securely and your hands needs to be free, so superfluous items will be stored in a bin that will be brought to your group at the end of the tour. 


Use  the restroom before you go. There are restrooms in the Lost Forest check-in area. Be sure to use the facilities before you start the tour. You won't see another restroom until the end of the tour.

Sun Protection

Bring sunscreen and sunglasses to protect from the high elevation sun.

Physical Requirements

Health Requirements

Guests who are under the influence of drugs or alcohol of any kind may not participate in this activity. Guests with the following medical conditions may not participate in this activity: (a) pregnant or think they may be pregnant, (b) heart condition, (c) seizure condition, (d) history of back or neck injury, or (e) any other medical condition that prevents guest from following the safety rules and guidelines.

Physical Requirements

Age: 12+ years old or accompanied by an adult
Height: Between 48-78 inches (122 to 198cm) and able to reach to at least 66 inches
Weight: Between 50–250 lbs. (22-113 kg)
Cancellation Policy
Completely unused Lost Forest Base, or Sightseeing tickets are refundable. Lost Forest Canopy, Treeline, and Sunset Tuesday Tickets require 48-hour cancellation notice. No refunds due to weather if operations remain open. No partial refunds.

Other Lost Forest Activities