Usda Plant Hardiness Zone 2024. Mapping plant hardiness zones, heat zones, growing degree days, and cumulative drought severity throughout this century. According to the new map released in november 2023, about half of the united states has shifted to a new hardiness zone.

Considered the current standard measure of plant hardiness, the usda 2023 plant hardiness zone map is based on average annual minimum winter temperatures. Bodie pennisi, extension horticulture specialist, university of georgia.