Usda Hardiness Zones 2025 Map. With the new usda plant hardiness map, our state now recognizes larger areas of zone 5a, particularly in urban and southwestern areas, supporting a broader palette of plants. The new map provides valuable insights for gardeners that just might alter the way they plan and schedule their plantings.
Over time they have changed a bit as temperatures have gotten warmer. The usda plant hardiness zones are related to the average lowest minimum temperature at a location.