Out of the 13 Planting Zones, Zone 1 is the coldest and Zone 13 the warmest, with a vast range in temperatures between the two extremes. Zone 1 ranges from -60 to -55°F, while Zone 13 ranges from ...

The USDA divides the United States into seven planting regions, known as hardiness zones, which were most recently updated in 2023. The maps below show these planting regions.

The warmest zone, 11b, is in Key West, Florida, where the coldest annual lows range from 45 F to 50 F. On the 2012 map, northern Minnesota had a much more extensive and continuous zone 3a.