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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 ...
How many zones are in the USDA cold hardiness map? A shaded pathway at Yew Dell Botanical Gardens leads to the Castle Terrace, a stone castle that was hand-built in the 1950's. June 14, 2022
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.
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 species is considered hardy to USDA Hardiness Zone 8, and may survive short periods of temperatures as low as −14 °C (7 °F). Large and older specimens can be found from southeastern Virginia south to Florida and west to Texas.
This was a period of warmer winters than the 1974–1986 period, especially in the eastern U.S.A. The 2003 map placed many areas approximately a half-zone higher (warmer) than the 1990 map had. Reviewers noted the map zones appeared to be closer to the original 1960 map in its overall zone delineations.
The last time the USDA changed the Hardiness Zone map was 2012. Although the changes are subtle, it does indicate that we are experencing warmer temps ... The 2023 map incorporates data from ...
Hopkins' bioclimatic law states that in North America east of the Rockies, a 130-m (400-foot) increase in elevation, a 4° change in latitude North (444.48 km), or a 10° change in longitude East (two-thirds of a time zone) will cause a biological event to occur four days later in the spring or four days earlier in the fall. [1]