Due to warming trends a new map has been issued to replace the most
recent one (from 1990 I believe). My home, in NC on the SC border, went
from 7B to 8a.

Here is a link to the main page. Once there you can get links for
downloads if you want or just check out what they have on the site.
http://planthardiness.ars.usda.gov/PHZMWeb/


Brian