Fat Sass Switchback Challenge

The Fat Sass Switchback Challenge is a trail running event held in Millburn, New Jersey, at the South Mountain Reservation's Locust Grove Picnic Area. Scheduled for October 5, 2025, it offers three race options: a 5K, a 3-hour, and a 6-hour challenge. Participants run a 1-mile loop featuring a steep 300-foot elevation gain, with half the course ascending the Lenape Trail and the other half descending switchbacks on technical, rocky terrain.

The event is a BYO (bring your own) affair, providing only water and bibs, with no swag or awards. All proceeds support Bigger Than The Trail, a nonprofit offering free therapy to those in need. Visit the organization's website for the most recent information.