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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 ...
According to the USDA, these zones are "based on the average annual extreme minimum winter temperature." They are displayed as "10-degree F zones ranging from zone 1 (coldest) to zone 13 (warmest ...
On the 2012 Plant Hardiness Zone map, Greater Columbus (and a good portion of the rest of Ohio) was in Zone 6a, where the average lowest temperature ranges from -10 to -5 degrees Fahrenheit ...
In 2006, the Arbor Day Foundation released an update of U.S. hardiness zones, using mostly the same data as the AHS. It revised hardiness zones, reflecting generally warmer recent temperatures in many parts of the country, and appeared similar to the AHS 2003 draft. The Foundation also did away with the more detailed a/b half-zone delineations. [6]
This list provides an overview of United States ecoregions designated by the U.S. Environmental Protection Agency (EPA) and the Commission for Environmental Cooperation (CEC).
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 climate and ecology of different locations on the globe naturally separate into life zones, depending on elevation, latitude, and location.The generally strong dependency on elevation is known as altitudinal zonation: the average temperature of a location decreases as the elevation increases.
The new data is based on 1991-2020 GIS data collected from over 13,000 weather stations.