Ironstone 100K

The Ironstone 100K. Legs of Iron. Resolve Like a Stone.

A Test of Endurance on the Wildest Trails of the Alleghenies 

Runners with legs of iron and resolve like stone will gather in Central Pennsylvania on July 11-12, 2026, to take on the forth annual Ironstone 100K Ultramarathon. This savage and grueling 100-kilometer (62-mile) point-to-point race weaves through some of the most challenging and scenic terrain in the Alleghenies, spanning Blair, Huntingdon, and Centre counties in Southern Pennsylvania.   

The Ironstone 100K is a brutal, soul-crushing nightmare disguised as a race. It’s a 100-kilometer slog through the most punishing, desolate trails in the Alleghenies, guaranteed to leave you questioning every life choice that led you here. The suffering starts on the usually hottest weekend of the year—because why not—and kicks off in the blistering afternoon heat. 

The first 20 miles drag on endlessly through mind-numbing, pancake-flat trails, setting the stage for your slow unraveling. Then comes the "fun": a relentless traverse on rocky ridges that seem like they’ll never end. You’ll stumble over jagged stones for what feels like an eternity, with no pacer to console your shattered spirit.
Aid stations? They’re few and far between, and getting to one feels like crossing a desert with no water in sight. And because this torture wasn’t enough, there are venomous snakes lurking along the way, just waiting to make your miserable experience even worse.
Finishing this race doesn’t feel like triumph—it feels like surviving a bad decision you’ll be haunted by forever.