The USDA recently updated their Plant Hardiness Zone map, per a article on The Daily Planet blog:
USDA revises its plant hardiness map, bringing climate change down to earth for millions of households across the country.
By Jennifer Weeks
for the Daily Climate
As winter retreats northward across the nation, gardeners are cleaning tools and turning attention to spring planting. But climate change is adding a new wrinkle, and now a standard reference – the U.S. Department of Agriculture’s Plant Hardiness Zone Map – is about to make very clear how much rising temperatures have shifted planting zones northward.
Read the entire article: Daily Climate: Climate Change Comes to Your Backyard .
View the updated map on the U.S. National Arboretum website.