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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.
The chilling requirement of a fruit is the minimum period of cold weather after which a fruit-bearing tree will blossom productively. It is often expressed in chill hours, which can be calculated in different ways, all of which essentially involve adding up the total amount of time in a winter spent at certain temperatures.
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. [38]
More recently the USDA maps have been reissued in 2012 and 2023. ... the maps have shifted our Texas hardiness zones north by several counties. ... That was proven back in the winter of 1983-84 ...
The new data is based on 1991-2020 GIS data collected from over 13,000 weather stations.
The National Agriculture Imagery Program (NAIP) acquires aerial imagery during the agricultural growing seasons in the continental United States. It is administered by the USDA 's Farm Service Agency (FSA) through the Aerial Photography Field Office (APFO) in Salt Lake City .
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