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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.
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 ...
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In the United States, the EPA and the United States Geological Survey (USGS) are the principal federal agencies working with the CEC to define and map ecoregions. Ecoregions may be identified by similarities in geology , physiography , vegetation , climate , soils , land use , wildlife distributions, and hydrology .
Retrieved from "https://en.wikipedia.org/w/index.php?title=USDA_Plant_Hardiness_Zones&oldid=59860879"https://en.wikipedia.org/w/index.php?title=USDA_Plant_Hardiness_Zones
Catheys Valley is categorized as being within the 9a USDA hardiness zone, meaning temperatures can get as low as 20 to 25 °F (−7 to −4 °C). [ 7 ] Climate data for Catheys Valley, CA (1,325 feet above sea level)
The wetter season occurs from November through March. The average annual rainfall over the ten years from 1997/98 through 2006/07 was 8.97 inches (228 mm). The city falls within USDA plant hardiness zones 9a (20 to 25 °F/-6.7 to -3.9 °C) and 9b (25 to 30 °F/-3.9 to -1.1 °C). [21] [22]