Us Hardiness Zone Map 2024 Pdf. The usda hardiness zone map divides north america into 13 zones, from zone 1 (coldest) to. Hardiness zones in many part of the u.s.
Each zone is further divided into a and b. For example, seattle, washington, and the city of austin, texas, are both in the usda hardiness zone 9a because the map is a measure of the coldest temperature a plant can handle.