Virginia Tech Dendrology Factsheets
- This USDA plant hardiness zone map is based on USDA Miscellaneous Publication
814, "Plant Hardiness
Zone Map," which was revised in 1965 and more recently in 2012. For our purposes, zonal subdivisions have
been combined. More
information about plant hardiness zones
- Canada hardiness zones developed by Natural Resources Canada
- Mexico range map based on the 1965 hardiness zone map.

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