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The USDA released a new hardiness zone map and half of the country has shifted. Read more here so you're ready to plant this spring. ... according to data collected by over 13,000 weather stations ...
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 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.
In 2012 the USDA updated their plant hardiness map based on 1976–2005 weather data, using a longer period of data to smooth out year-to-year weather fluctuations. [7] Two new zones (12 and 13) were added to better define and improve information sharing on tropical and semitropical plants, they also appear on the maps of Hawaii and Puerto Rico.
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.
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
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