Usda Plant Hardiness Zones 2024. The usda hardiness zone map is a valuable tool for assessing plant hardiness based on average annual extreme minimum winter temperatures. These zones are delineated based on the average annual lowest minimum temperature.

Department of agriculture today released its new plant hardiness zone map, the national standard by which gardeners can determine which plants are most likely to. The usda plant hardiness zone map (phzm) is the standard by which gardeners and growers can determine which plants are most likely to thrive at a location.