Usda Plant Hardiness Zones 2024 Calendar. Usda released a new version of its plant hardiness zone map (phzm), updating this valuable tool for gardeners and researchers for the first time since 2012. The idea has been adapted to the differing needs of places in different climates.

Each growing zone is 10°f warmer (or colder) in an average winter than the adjacent zone. Essentially, it tells you how cold your area gets on average.