Ironstone 100K | A Savage Ultramarathon

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Ironstone 100K: A Test of Endurance on the Wildest Trails of the Ridge and Valley of Pennsylvania

Legs of Iron. Resolve Like a Stone.

July 11-12, 2026

Ironstone 100K
Legs of Iron. Resolve like a Stone.

RACE BEGINS

Ironstone 100K Presenting "White-Blaze" Sponsor

The Ironstone Tramline

For Giving Tuesday, We Give Back.

At Eastern States Trail-Endurance Alliance (ESTEA)—home of Eastern States 100, SHEastern States, Ironstone 100K, and the Eagleton Trail Challenge—we’re proud to be a local, all-volunteer, grassroots organization. Everything we do is built on stewardship: for our trails, for our trailrunners, and for the communities that support and sustain us. One of our core missions is to strengthen unity and cooperation among trailrunners, fellow users of public lands, and the towns and or