USDA Plant Hardiness Zone Map
The USDA Plant Hardiness Zone Map is the standard by which gardeners and growers can determine which plants are most likely to thrive in a specific location. The map is based on the average annual minimum winter temperature, divided into 10-degree F zones.
For the first time, the map is available as an interactive GIS-based map. Users may also simply type in a ZIP Code and find the hardiness zone for that area.
Go to planthardiness.ars.usda.gov to find your zone.