Ironstone 100K Ultra
Hollidaysburg, United States • 11-12 Jul 2026
Ironstone 100K
Ironstone 100K is a point-to-point trail ultramarathon covering 100-kilometers (62 miles) across the Ridge and Valley region of southern Pennsylvania. The route runs from the Juniata River watershed into Rothrock State Forest and spans Blair, Huntingdon, and Centre counties.
The event is scheduled for July 11 to 12, 2026. The organizer is the Eastern States Trail-Endurance Alliance, a local all-volunteer grassroots group that emphasizes stewardship of trails, support for trailrunners, and cooperation with nearby communities and public land users. The race route is identified as the Ironstone Tramline and materials for the event include course maps and charts, a course narrative in multiple parts, a race timeline, race rules, and aid station and crew information.
Recent notices for the course include a closure at the Dilling Bridge on the Lower Trail (mile 11.4) and a traffic alert affecting Aid Station 4 at Alfarata due to a local festival. The event maintains records of past results and reports for multiple years and provides guidance for lodging, camping, and volunteer roles. Support infrastructure and event logistics are addressed through published aid station and crew information. Visit the organization's website for the most recent information.