About Our Clickable Species Maps
USDA Hardiness Zones
- 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 1990.
represent average annual minimum temperatures, in 10°F increments.
are species (not varieties) that are commonly
- Clicking on a state generates a listing of native and naturalized species
for that state.
- For our purposes, zonal subdivisions in the original map have
- For the original map, along with additional information, please visit
the National Arboretum
North American Floristic Regions (Biomes)