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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.
Planting corn in mid-April proved successful in Iowa study. To achieve 98% of the corn yield potential, the data shows you should plant corn between April 12 and April 30 in northeast Iowa. In northwest, west central, central, and east central Iowa, the best time to plant corn is from April 15 to May 9. In the remainder of the state (the bottom three tiers of counties in Iowa) to reach the 98% yield window you need to plant corn April 17 to May 8.