University of Minnesota Extension Corn Specialist, Dr. Jeff Coulter, has provided updated corn planting guidelines for the wet spring of 2014. Dr. Coulter indicates that with the recent and expected rainfall, many growers may not be able to resume field work until May 3rd or early next week. This has led to questions about corn yield potential when planting is delayed. University of Minnesota planting date studies show that highest corn yield typically occurs when planting is completed by mid-May. In a study from 2009 to 2011 at Lamberton, Morris, and Waseca, MN that was funded by the Minnesota Corn Growers Association, average grain yield was within 98% of the maximum if planting was completed by May 15.