In one of my nursery magazines today, I learned we now have a new, updated USDA Hardiness Zone Map!!
"This is the most sophisticated Plant Hardiness Zone Map yet for the United States," said Dr. Catherine Woteki, USDA Under Secretary for Research, Education and Economics. "The increases in accuracy and detail that this map represents will be extremely useful for gardeners and researchers."
Here's the link to the new map: http://planthardiness.ars.usda.gov/PHZMWeb/#