Plant Hardiness Zone 2024. The plant hardiness zone map serves as a guide based on average low temperatures, but other factors and local conditions significantly influence plant survival. Usda’s plant hardiness zone map is the standard by which gardeners and growers can determine which plants are most likely to thrive at a location.
Zone 9b has a temperature range of 25 to 30°f. Below is a detailed table of planting zones according to the usda hardiness zones, making it easy for you to identify your local planting zone.