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The map in this guide is based on the USDA Plant Hardiness Zone map that uses average minimum winter temperatures across the country to determine what plants will survive winter where you live.
The USDA map covers 13 zones with temperatures ranging from -60 degrees Fahrenheit (zone 1) to 70 degrees Fahrenheit (zone 13). At the top of the map here, you’ll find Zone 2, and, traveling south, the numbers increase to zone 10 in the southernmost points of the United States. Each zone represents a 10 degrees Fahrenheit range, so, for example, zone 7, represented by the pale green belt across the middle of the country, experiences an average minimum temperature in winter of 0 to 10 degrees Fahrenheit.