Ironstone 100K Ultra
Hollidaysburg, United States • 11-12 Jul 2026
Ironstone 100K
The Ironstone 100K is a point-to-point ultramarathon of 100 km held in the Alleghenies. The event is organized by the Eastern States Trail-Endurance Alliance (ESTEA), an all-volunteer grassroots organization. The 2026 event dates listed are July 11-12, 2026. The race begins at the Ironstone Tramline. The event is part of the GrandSlam SufferFest Series.
Course, aid and race rules
The course is on trail and is point-to-point. The organizer states there are minimal aid stations and no pacers are allowed. A course update notes a closure at the Dilling Bridge on the Lower Trail at about mile 11.4. A traffic alert was issued for Aid Station 4 at Alfarata due to a local county festival affecting nearby roads. Race materials include a race rules page, course maps and charts, and aid station and crew information.
Other details
The event features Trail Sisters Approved Standards, including equal podiums and awards, women’s specific apparel and swag, menstrual products at aid stations, and a pregnancy and postpartum policy. Results and reports from prior years (2022–2025) are listed on the event pages. Visit the organization's website for the most recent information.