Eastern States 100
Waterville, United States • 8 Aug 2026
Event overview
Eastern States 100 is a single-loop ultramarathon in the Wilds of Pennsylvania. The course length is 103 miles and it circumnavigates the Pine Creek watershed, described on the site as the Circumnavigation of the Lost and Bewildered River. The route follows trail terrain and includes more than 20,000 feet of cumulative climbing. The organizer notes the race is not an entry-level ultramarathon because of course terrain, elevation gain, and potential weather conditions.
Organization and timing
The event is presented by the Eastern States Trail-Endurance Alliance. The same organization manages the Ironstone 100K and the Eagleton Trail Challenge and states a mission of promoting trailrunning and the responsible use of public lands. The 2026 edition is scheduled for August 8, 2026. Registration for the 2026 race opens October 1, 2025, at 6 p.m. EST. Additional race information pages referenced include race rules, aid station details, crew and spectator information, and course maps and narrative. Visit the organization's website for the most recent information.