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What are Hardiness Zones?

“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.
For the first time, the map is available as an interactive GIS-based map, for which a broadband Internet connection is recommended, and as static images for those with slower Internet access. Users may also simply type in a ZIP Code and find the hardiness zone for that area.”***

Keep in mind that local variations such as moisture, soil, winds, and other conditions might affect the viability of individual plants.

***USDA, Agriculture Research Service
https://planthardiness.ars.usda.gov/phzmweb/interactivemap.aspx