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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 ...
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]
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.
The old 2012 map, seen here, isn't as detailed or regional as the new plant hardiness map, in large part to the 2023 map including data from many more weather stations.
USDA plant hardiness zone regional map - North Central US. The climate is humid continental, displaying both the cool summer and warm summer subtypes as one travels from north to south. [24] The United States Department of Agriculture has the region falling mainly in zone 5a, with the northern fringe being 4b. A few patches in Wisconsin are 4a.
"Level I" divides North America into 15 broad ecoregions. "Level II" subdivides the continent into 52 smaller ecoregions. "Level III" subdivides those regions again into 182 ecoregions. [1] [2] "Level IV" is a further subdivision of Level III ecoregions. Level IV mapping is still underway but is complete across most of the United States.
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