The effect that selected characteristics of a Pennsylvania hay auction has on winning bids of loads of hay are presented in this paper. Survey data from 107 buyers over the period September 1982 to April 1983 were used. Hay type, perceived quality, and the intended use of the hay were found to be significant factors in explaining prices paid per ton. Sellers could increase their revenues by producing alfalfa hay, alfalfa and legume-grass hay of higher quality, and attending marketing days with a larger number of horse feed buyers.