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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.
The planting zones, also called hardiness zones, divide the United States, Mexico and Canada into 11 areas. Each of the gardening zones is based on a 10 degree Fahrenheit difference in the average annual minimum temperature. Planting Zones 1 and 2a, the coldest, represent Canada. The United States falls within zones 2 through 10. Hawaii and Mexico are represented by zone 11, the hottest zone.