Some of the best peaches I’ve ever eaten are from Chambersburg, PA. When I was a student at Gettysburg College, there was a roadside stand right along US30, and I’d buy them by the bushel.
Peach trees don’t really flourish even here in northern North Carolina, they need to be babied and don’t bear nearly as much fruit as they do an hour south of here, so I’m surprised that someone has had success growing peaches commercially in PA. Different, more winter-hardy variety of peach?