USDA has released an updated Plant Hardiness Zone Map, the standard by which gardeners and growers can determine which plants are most likely to thrive at a location. This is the first update since 2012, and it provides increased accuracy and detail. It was developed by USDA’s Agricultural Research Service and Oregon State University’s PRISM Climate Group. The map is available online and designed to be user-friendly. When compared to the 2012 map, the 2023 version reveals that about half of the country shifted to the next warmer half zone, and the other half of the country remained in the same half zone. USDA notes that these national differences in zonal boundaries are mostly a result of incorporating temperature data from a more recent time period.