R.R.
Hi there and happy fall! I found an awesome website yesterday that lists all the patches in Northern Virginia and what they offer and links to their sites. So when i saw your question, I had to respond. Here is it is!!
http://www.pumpkinpatchesandmore.org/VApnorthen.php
I went to Stribling Orchard two weekends ago and did the pick your own apples, which was alot of fun for our family. We plan to hit up either Cox Farms or Pumpkinville in the next week.
Good luck.:) R.