Usda Plant Hardiness Map 2025. For decades, gardeners and growers have relied on the usda’s plant hardiness zone map to decide what perennials, shrubs and trees are best to grow in any specific region of the country. There's a good chance your zone shifted when the usda updated its plant hardiness map in 2023.

Considered the current standard measure of plant hardiness, the usda 2023 plant hardiness zone map is based on average annual minimum winter temperatures. Usda’s plant hardiness zone map is the standard by which.