Green Monster Trail Challenge
Wellsboro, United States • 12 Oct 2025
Event overview
The Green Monster Trail Challenge is a trail running event in Wellsboro, Pennsylvania, held on Sunday, October 12, 2025. The courses are located in the mountains of the Tioga State Forest, north of the Pennsylvania Grand Canyon. The event is organized by the Tyoga Running Club and lists a maximum field size of 350 participants. Online registration closes September 28, 2025; there is no day-of registration.
Race details
Distances offered:
- 15K - 1700 ft total ascent
- 25K - 4000 ft total ascent
- 50K - 7800 ft total ascent
The courses include single-track trails, steep climbs, stream crossings, and technical descents. The event provides maintained aid stations, post-race lunch and beverages, music and entertainment, race-day shirts and other swag, and finisher medals. The organizer states a no-refund policy with no transfers, deferrals, or entry switches. The race start area is listed at 176 Straight Run Road, Wellsboro, PA. Visit the organization's website for the most recent information.