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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.
Forget maps......Chicago is in zone 5...and gardeners wishing to plant those plants that are hardy to the Chicago area had better realize that zone 5 plants are the ones to buy. Besides zones are a relative term. Chicago is on the shores of Lake Michigan and the closer to the Lake, the more moderate the temperatures.