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New Plant Hardiness Zone Map Has Iowa in Zone 5. Article | Fri, 01/27/2012 - 09:39 | By Richard Jauron, Jennifer Bousselot, Willy Klein. AMES, Iowa â Gardeners and researchers have a new, updated plant hardiness zone map to consider as they make plant selection decisions this year. The U.S. Department of Agriculture (USDA) released the new version of the map this week â the first update since 1990 â with much of Iowa now considered Zone 5. Plant hardiness zone designations represent the average annual minimum temperatures at a given location.
This is an enlarged version of the 1990 USDA Plant Hardiness Zone Map, for the state of Wisconsin. USDA plant hardiness zones are used to select perennials, landscape plantings and fruit trees that will survive over winter in your location. Check the color of the section in your area on the map with the color key below.