Find Your Hardiness Zone

USDA hardiness zones divide the US into 13 zones based on average annual minimum winter temperatures. Each zone covers a 10°F range, with subzones (a and b) covering 5°F. Zone 1 is the coldest (-60°F) and zone 13 is the warmest (65°F). They help gardeners select plants that survive local winters.

Enter your ZIP code in our free tool above and we will instantly display your USDA hardiness zone, temperature range, and recommended plants. You can also check the USDA Plant Hardiness Zone Map at planthardiness.ars.usda.gov.

You can grow warmer-zone plants as annuals, in containers you bring indoors for winter, or with winter protection like mulching and wrapping. Microclimates near south-facing walls or in sheltered courtyards may support plants rated one zone warmer.

Hardiness zones are based on minimum winter temperatures and indicate cold tolerance. Heat zones, developed by the American Horticultural Society, measure the number of days above 86°F and indicate heat tolerance. Both are useful for selecting plants suited to your climate.

Yes. The USDA updated its Plant Hardiness Zone Map in 2023 using data from 1991-2020. Many areas shifted half a zone warmer compared to the 2012 map, reflecting rising average minimum temperatures across the country.