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The USDA Plant Hardiness Zone Map is the standard by which gardeners and growers can determine which perennial plants are most likely to thrive at a location. The map is based on the average annual extreme minimum winter temperature, displayed as 10-degree F zones and 5-degree F half zones.
Cold Hardiness zones are based on the average annual minimum temperature in a given area of the country, with USDA Zone 1 being the coldest at minus 50 degrees F and USDA Zone 13 the warmest at above 60 degrees F.
Jun 14, 2024 · Considered the current standard measure of plant hardiness, the USDA 2023 Plant Hardiness Zone Map is based on average annual minimum winter temperatures. The map is divided into thirteen distinct 10ºF zones, which are further divided into sub-zones of 5°F.
The map is based on the average annual minimum winter temperature, divided into 10-degree F zones. For the first time, the map is available as an interactive GIS-based map (above), for which a broadband Internet connection is recommended, and as static images for those with slower Internet access.
The overlay of colored zones on the map provides a convenient tool for understanding and comparing plant cold-hardiness across the United States and can facilitate the selection of appropriate perennial plants based on their observed performance in other regions of the country.
Nov 15, 2023 · The 2023 map is based on 30-year averages of the lowest annual winter temperatures at specific locations, is divided into 10-degree Fahrenheit zones and further divided into 5-degree Fahrenheit half-zones.
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May 13, 2024 · Zones are determined based on the average of the coldest temperature each winter over a 30-year period. The 2023 map references temperature data from 1991-2020. The map uses a temperature...
