New Hardiness Zone Map 2024 Usa. According to the new map released in november 2023, about half of the united states has shifted to a new hardiness zone. The plant hardiness zone map is based on the average lowest temperature a location receives sometime each winter.
The usda hardiness map—the official name is plant hardiness zone map—helps gardeners determine which perennial plants can survive in their climate. 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.