New Gardening Zones 2024. The plant hardiness zones detailed in the new map define 13 distinct zones across the us and its territories. According to the new map released in november 2023, about half of the united states has shifted to a new hardiness zone.
That rate slows as the tree matures. Released in november 2023, the updated map was developed by oregon state university’s prism climate group and the usda’s agricultural research service.