Hardiness Zone Map 2024. This essential tool is a guide to the coldest temperature you. The usda plant hardiness zone map (phzm) is the standard by which gardeners and growers can determine which plants are most likely to thrive at a location.
The usda plant hardiness zone map divides the country into 13 zones based on average annual minimum temperatures. Usda’s plant hardiness zone map is the standard by which gardeners and growers can determine which plants are most likely to thrive at a location.