Usda Planting Zones 2024. The usda plant hardiness zone map divides north america into 13 zones based on the average annual minimum winter temperature. The usda plant hardiness zone map is the standard by which gardeners and growers can determine which perennial plants are most likely to thrive at a location.

It also includes national, state and. Each growing zone is 10°f warmer (or colder) in an average winter than the adjacent.