Prepare to push your limits at the Worlds End Ultramarathon, a truly epic journey through the rugged heart of Pennsylvania's Endless Mountains. On May 30, 2026, runners will gather at the Cliff Pavilion in Worlds End State Park, Forksville, PA, to tackle either the demanding 100K or the challenging 50K distance. Known for its pure, untamed beauty and notoriously tough terrain, this race has earned a reputation as one of the most difficult ultras in the state, consistently selling out within minutes each year. Typical race day conditions in late May offer pleasant highs around 69F and lows around 49F, with a 20% chance of precipitation.

The course is a relentless test of grit, predominantly weaving along rugged single-track that explores the famed Loyalsock Trail and surrounding Loyalsock State Forest. Participants should anticipate a "hilly" or "rolling" profile with an "irregular rhythm EKG" elevation gain, including countless shorter climbs that accumulate to an impressive 12,400 feet for the 100K and 5,900 feet for the 50K. Runners will navigate often rock-strewn and technical trails, rewarded with breathtaking scenery at every turn. Expect to pass stunning rock formations, serene Sones Pond, and a wooden ladder alongside Rode Falls, with numerous vistas like High Rock and Canyon Vista offering panoramic views. Keep an eye out for bald eagles as you traverse the rocky ledge overlooking Loyalsock Creek. This is not an entry-level ultra; the 100K even requires prior completion of a 50K trail race, underscoring the formidable challenge that awaits.

Aid stations are strategically placed to support runners through this grueling endeavor. The 100K boasts 12 to 13 aid stations, with 7 offering crew access and 3 allowing pacer exchanges. The 50K features 6 aid stations, though pacers and crew access are not permitted for this distance. Beyond the usual ultra fare, runners can anticipate a hearty selection of fresh fruit, bacon, homemade soups, chili, pulled pork, and burgers, catering to various dietary needs at the finish. Finishing the Worlds End Ultramarathon is a significant accomplishment, with the 100K serving as a qualifying event for the prestigious Western States 100 and a leg of the Pennsylvania Triple Crown of Ultrarunning. Runners consistently praise the dedicated volunteers and the profound sense of achievement earned by conquering this exceptionally beautiful and challenging course.