Soybean yields tend to increase with rising plant populations. However, soybean yield responses to plant population are generally small and often inconsistent. In general, increasing plant populations also increase plant height and result in greater yield losses from lodging. Soybean seed prices have risen tremendously over the last couple of years. My hypothesis is that we can reduce our seed cost when we need to replant a field. The objective of this experiment was to determine the optimum plant population across different planting dates in northeast Iowa.