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 more information and to find out which zone you are in log on to the USDA website at https://planthardiness.ars.usda.gov/PHZMWeb/