FWIW,

Here's a link to a nice .pdf doc on growing varieties, etc. in VA.
I noted a few references to winchester area,etc. Not *too* wildly
different from PA. At elast recommends specific varieties, so it
might be helpful;

http://www.ext.vt.edu/pubs/viticultu...19/463-019.pdf

All I did was google, "grape growing in virginia" to get this and others.
See what you get for PA.

Good Luck,

Andrew