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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.
CORN IS GROWN ON MORE ACRES OF IOWA LAND THAN ANY OTHER CROP. Planted acreage reached a high in 1981 with 14.4 million acres planted for all purposes. and has hovered near 12.5 million acres since the early 1990s. Table 1 shows the trend in. corn acreage, yield, and production since 1900 as reported by the Iowa Agricultural.