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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]
Since 1981, the wettest calendar day has been 6.66 inches (169 mm) on September 30, 2010. During the winter months, the plant hardiness zone is 5b with an average annual extreme minimum air temperature of −10.3 °F (−23.5 °C). [15] Since 1981, the coldest air temperature has been −22.7 °F (−30.4 °C) on January 21, 1994.
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.
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In order to bring your produce to your table, you need to plant at the right time. A couple of quick notes: There are many more factors that determine how well your vegetables will grow ...
The plant hardiness zone is 6b with an average annual extreme minimum air temperature of −1.0 °F (−18.3 °C). [35] The spring bloom typically begins by April 11 and fall color usually peaks by October 29.
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