Kyle Oldegard, Capitol Press, November 28th 2023.
The USDA’s new Plant Hardiness Zone Map shows temperatures about 2.5 degrees higher in the United States than the previous version released in 2012.
The map is used to determine what plants will likely survive the coldest annual weather at locations.
The Plant Hardiness Zone Map was jointly developed by the USDA Agricultural Research Service and Oregon State University’s PRISM Climate Group, which is part of the OSU College of Engineering.
New data resulted in about half the country shifting to a warmer 5-degree half zone, said Christopher Daly, PRISM Climate Group director and the map’s lead author.