TopCross Blend^® high oil corn blends have added a new dimension to the specialty grain market. Producers have been able to utilize the higher oil content of the grain for their own livestock operations or contract their grain for a premium price. Little is known about the effects of cultural agronomic practices on the grain composition of high oil corn, particularly how the percentage of oil is affected. As a result, research is needed to evaluate the effects of planting date and to determine if there is a limited period in which high oil corn can be planted without detrimental effects. During the 2000 and 2001 growing seasons, the effects of planting date were evaluated in this study, which was conducted concurrently at two other university research farms.