New 2012 Plant Hardiness Zone Map

http://planthardiness.ars.usda.gov/PHZMWeb/

 At the USDA website, you can Click on the Map  or Enter Zip Code

This map will help you to know the average coldest temperatures of your area.

USDA Plant Hardiness Zone Map

The 2012 USDA Plant Hardiness Zone Map is the standard by which gardeners and growers can determine which plants are most likely to thrive at a location. The map is based on the average annual minimum winter temperature, divided into 10-degree F zones.