The USDA Plant Hardiness Zone Map is the standard by which gardeners and growers can determine which perennial plants are most likely to thrive at a location. The map is based on the average annual extreme minimum winter temperature, displayed as 10-degree F zones and 5-degree F half zones. A broadband internet connection is recommended for the ...

Half Zones include A/B subdivisions, for more specific temperature ranges at a location. Full Zones do not include these subdivisions, and are thus broader indications of temperatures. 2023-2012 Difference maps show the change in half zones between the 2023 and 2012 editions of the map. National maps are available in 150 or 300 dpi, in PNG format.

The Plant Hardiness Zone Map (PHZM) is based on the average annual extreme minimum winter temperature, displayed as 10-degree F zones ranging from zone 1 (coldest) to zone 13 (warmest). Each zone is divided into half zones designated as ‘a’ and ‘b’.

This edition of the USDA Plant Hardiness Zone Map (PHZM) is GIS (Geographic Information System)-based and is specifically designed for the Internet. It enables viewers to examine plant hardiness zones at a much finer scale than 1990 and earlier maps. A very sophisticated algorithm was used to interpolate low-temperature values between actual ...

The 2023 USDA Plant Hardiness Zone Map helps gardeners determine which plants are most likely to thrive based on average annual minimum winter temperatures.

The 2012 USDA Plant Hardiness Zone Map allows gardeners and growers to determine which plants are most likely to thrive at a location. The map is based on the average annual minimum winter temperature, divided into 10-degree F zones.