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SUPPLEMENTAL VOL. 1 USDA Unveils New Plant Hardiness Zone Map The U.S. Department of Agriculture (USDA) today released the new version of its Plant Hardiness Zone Map, updating a useful tool for gardeners and researchers for the first time since 1990 with greater accuracy and detail. The new map — jointly developed by USDA's Agricultural Research Service and Oregon State University's PRISM Climate Group — is available online at http://www.planthardiness.ars.usda.gov . ARS is the chief intramural scientific research agency of USDA. For the first time, the new map offers a Geographic Information System based interactive format and is specifically...

On January 25, 2012, The U.S. Department of Agriculture (USDA) released the new version of its Plant Hardiness Zone Map (PHZM), the first major update since 1990. See the new map, detailed state specific PHZMs, as well as PHZMs for Australia, Canada, China, Europe, and Japan...