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.
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Copyright
Map graphics. As a U.S. Government publication, the USDA Plant Hardiness Zone Map itself (as a graphic) is not copyrighted and is in the public domain. Map graphics may be freely reproduced and redistributed. The USDA-ARS and OSU logos must be prominently displayed in any reproduced or redistributed map graphics. Zone boundaries and designations and other features may not be altered without an explicit and prominently displayed disclaimer that the map is not the official USDA Plant Hardiness Zone Map, and USDA-ARS and OSU logos must not be displayed in the modified version.
Files in varying resolutions and formats may be downloaded and/or printed from this website.