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According to the new map released in November 2023, about half of the United States has shifted to a new hardiness zone. That's really big news if you consider 80 million Americans use this map to ...
As of the most recent release, the November 2023 map has the US broken into 13 cold hardiness zones in 10-degree Fahrenheit intervals, with each zone further broken into “a” (the warmer half ...
The new data is based on 1991-2020 GIS data collected from over 13,000 weather stations. OSU Extension: A new plant hardiness zone map from the USDA Skip to main content
In addition to the USDA Hardiness zones there are American Horticultural Society (AHS) heat zones. The criterion is the average number of days per year when the temperature exceeds 30 °C (86 °F). The AHS Heat Zone Map for the US is available on the American Horticultural Society website. [89] [90]
Hardiness of plants is defined by their native extent's geographic location: longitude, latitude and elevation. These attributes are often simplified to a hardiness zone. In temperate latitudes, the term most often describes resistance to cold, or "cold-hardiness", and is generally measured by the lowest temperature a plant can withstand.
The USDA updated the US Hardiness Zone map in 2003, it led to significant reclassifications in the the Deep South, including moving Atlanta, Charlotte, Birmingham and Memphis from Zone 7 to Zone 8. I cannot find a 2003 map that is from a source eligible to be uploaded to wikipedia.
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