Nearly half of the corn acreage in New York state is harvested as corn silage. The correct crop moisture content is critical for nutritional value and proper ensiling. Visual estimation of plant moisture is problematic, based on visual assessment of stover, or on kernel milkline. Moisture content of stover changes very little until after the optimum harvest time for corn silage. Ear moisture is the primary driver of whole plant moisture content. The old rule of one-half milkline has been mostly replaced by two-thirds to three-quarters milkline, but milkline is still not necessarily well related to whole plant moisture. Our overall goal is to be able to accurately predict whole plant moisture in the field.