Hardiness Zone Map 2024. The new map—jointly developed by usda's agricultural research service (ars) and oregon. Released in november 2023, the updated map was developed by oregon state university’s prism climate group and the usda’s agricultural research service.
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. Mapping plant hardiness zones, heat zones, growing degree days, and cumulative drought severity throughout this century.