PHZM GIS Data
Official USDA Plant Hardiness Zone Maps for the Conterminous United States, Alaska, Hawaii, and Puerto Rico
Climate Source is the exclusive public distributor of digital GIS versions of the U.S. Department of Agriculture’s Official 2012 Plant Hardiness Zone Map (PHZM). This PHZM data set provides 1976-2005 mean extreme annual minimum temperature in grid or shapefile formats, at an enhanced, effective resolution of approximately 400 m (15 arc-seconds) for the conterminous United States, 200 m (7.5 arc-seconds) for Hawaii and Puerto Rico, and 2 km (1.25 arc-minutes) for Alaska. The shape files are presented as 5°F half-zone classifications in an easy-to-use format. The grids provide actual temperature values, giving sub-zonal precision suitable for scientific usage. Grids and shapefiles are available by state or region.