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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 ...
In 1960 the United States Department of Agriculture published its first map based on data from 450 weather stations, but its standards were different from those of the Arnold Arboretum experts ...
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. ... 800-290-4726 more ways to reach us. Mail. Sign in.
In addition to the USDA Hardiness zones there are American Horticultural Society (AHS) heat zones. The criterion is the average number of days per year when the temperature exceeds 30 °C (86 °F). The AHS Heat Zone Map for the US is available on the American Horticultural Society website. [89] [90]
Development of a new USDA plant hardiness zone map for the United States. Journal of Applied Meteorology and Climatology, 51(2), pp.242-264. Hijmans, R.J., S.E. Cameron, J.L. Parra, P.G. Jones and A. Jarvis, 2005. Very high resolution interpolated climate surfaces for global land areas. International Journal of Climatology 25: 1965-1978.
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.
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 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