Well, SE Virginia anyways, go to the Great Dismal Swamp NWR. Starts out in
Apr with orange-tips and nymphalids(lots and lots of Mourning Cloaks on the
dirt roads) progressing all the way through the summer and fall with lots of
various Swallowtails and lots more. Lots of good snakes to see too. Take a
lot of DEET, the mosquitos and deerflies are ferocious.
Good luck,
Joel