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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 ...
The new data is based on 1991-2020 GIS data collected from over 13,000 weather stations.
For example, Seattle, Washington, and the city of Austin, Texas, are both in the USDA hardiness zone 9a because the map is a measure of the coldest temperature a plant can handle.
For practical purposes, Canada has adopted the American hardiness zone classification system. The 1990 version of the USDA Plant Hardiness Zone Map included Canada and Mexico, but they were removed with the 2012 update to focus on the United States and Puerto Rico. [8] The Canadian government publishes both Canadian and USDA-style zone maps. [37]
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.
According to the United States Department of Agriculture, the Plant Hardiness zone is 3b with an average annual extreme minimum temperature of −30.7 °F (−34.8 °C). [7] Summers are warm with chilly nights in the 30s and 40s (°F) and some thunderstorm activity during the months of July and August. Winters are cold and dry with lows below zero.
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