USDA Plant Hardiness Zone Map


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January 10, 2024. By Leslie Cameron, Extension Master Gardener, and Kirsten Conrad, Extension Agent, Agriculture and Natural Resources & Environmental Horticulture. The 2023 USDA Plant Hardiness Zone Map, released in November 2023, was the first update since 2012. Not surprisingly, the new map reflects warming temperatures.


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Description 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.


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USDA Hardiness Zones Illinois map. Source: USDA. Illinois now has six zones, with 12 sub-zones, ranging from zone 5a in northwestern Illinois to the newly added 7b zone in southern counties. "In Illinois, the most obvious change between the new hardiness zone map and the 2012 map is a northward progression of zones 6a, 6b, and 7a," Ford said.


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If you live outside North America. You can roughly translate the USDA hardiness zones by finding out how low your area's temperatures can reach, and then use the chart below to find your corresponding zone. Zone 1: below -46 C (below -50 F) Zone 2: -46 to -40 C (-50 to -40 F) Zone 3: -40 to -34 C (-40 to -30 F) Zone 4: -34 to -29 C (-30 to -20 F)


USDA Plant Hardiness Zone Map

The Plant Hardiness Zone Map (PHZM) is based on the average annual extreme minimum winter temperature, displayed as 10-degree F zones ranging from zone 1 (coldest) to zone 13 (warmest). Each zone is divided into half zones designated as 'a' and 'b'. For example, 7a and 7b are 5-degree F increments representing the colder and warmer.


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The USDA Plant Hardiness Zone Map (PHZM) shows the 13 hardiness zones throughout the United States (zones 12 and 13 are relatively new additions for Puerto Rico and Hawaii), broken into subzones—for instance, zones 7a and 7b. Data is collected for a 30-year period from 7,983 temperature stations to create the hardiness zone map.


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This winter, the U.S. Department of Agriculture released a new Plant Hardiness Zone Map , considered to be a national standard that gardeners can reference to know which plants are most likely.


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Plant Hardiness Zone Map; Plant Hardiness Zone Map. The USDA Plant Hardiness Zone Map website includes an interactive-GIS map that allows the viewer to "click" down in scale to one-half mile. It also includes national, state and regional images in a variety of resolutions, and a ZIP code finder that provides the plant hardiness zone for all.


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The 2023 Plant Hardiness Zone Map is now available as a premier source of information that gardeners, growers and researchers alike can use. (Image courtesy of Getty Images) Plant hardiness zone designations represent what's known as the "average annual extreme minimum temperature" at a given location during a particular time period (30.


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Below is the 2023 USDA Plant Hardiness Zone Map. The USDA's Agricultural Research Service (ARS) and Oregon State University's (OSU) PRISM Climate Group developed the new map to be more accurate and more detailed than previous maps.


USDA Plant Hardiness Zone Map

Washington, Oregon, Montana, Idaho, Wyoming, and Northern California encompass the North West gardening region, which spans zones 3 to 9. These conditions are typically wet in the winter seasons and dry during the summer. The first and last frost usually occur in September and April in this region. South Central.


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This map of climate zones will help you select plants for your garden that will survive a typical winter in your region. The United States Department of Agriculture (USDA) developed the map. The ones are based on the average lowest temperatures across the United States. Zone 1 is the coldest region and Zone 11 is the warmest.


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In the United States, planting zones are specific locations that correspond to which plants can grow well there. The planting zone map is based on the average annual minimum winter temperature, and which varieties of flowers and plants can survive and thrive in those conditions.


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Planting zones are areas you can find on a growing zone map that show exactly which plants are best suited to thrive in your given area, or zone. When shopping for new plants for your garden landscape, the terms "plant hardiness zones," "growing zones" and "planting zones" may at first seem a bit confusing.


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Plant Zone Map Courtesy of USDA Note: The USDA Plant Hardiness Zone Map was just updated in November of 2023, the first update since 2012. According to the USDA, the new 2023 map uses data from 13,412 weather stations compared to the 7,983 from the previous map.


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The 2012 USDA Plant Hardiness Zone Map is the standard by which gardeners and growers can determine which plants are most likely to thrive at a location. The map is produced by the U.S. Department of Agriculture (USDA) Agricultural Research Service (ARS) and is available on their website.