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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.
Plant Zone Map For Planting Zones. Below is a listing of U.S. planting zones that show the United States by planting zone. Planting zones are used as a guideline to determine the hardiness and survivability of various trees and plants in geographic areas.When ordering a tree or plant, make sure it is available in your particular zone.ou may determine which planting zone you are in by checking your geographic area on this map and determining your hardiness zone. However, this is only a guide since conditions for growing will vary in certain areas. Â© 2002-2015, Nature Hills Nursery, Inc. or its affiliates.