Minnesota farmers oftentimes face the possibility of not being able to plant corn until after the optimum planting date due to wet soil conditions in the spring. Current yield by planting date tables are based on data obtained a decade ago. Consequently, there are questions as to the validity of this data given advances in corn genetics over time. As corn acreage in northern Minnesota increases, this information becomes even more critical given new corn genetics. The objective of this study is to provide Minnesota corn growers with up-to-date information about corn yield losses associated with late planting.