Comparing the 2023 map to the previous version from 2012 clearly shows that as climate change warms the Earth, plant hardiness zones are shifting northward. On average, the coldest days of winter ...

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.

A new USDA (U.S. Department of Agriculture) Plant Hardiness Zone Map has been released. Last released in 2012, the newly released map shows some stark changes in the last 10 years. Prior to the ...

The U.S.D.A. updated its Plant Hardiness Zone Map last week for the first time in more than a decade, showing that about half the United States had moved into a slightly warmer zone.