. l9j'7. Feeding value for beef steers of corn silage as affected by harvest dates and frost. Can. J. Anim. An experiment was conducted in 3 consecutive yr with corn grown each year on a field from which silage was made of corn harvested at different dates before and after freezing. Yields of green and dry weight were recorded at each harvest.Individual whole plants and ptant parts were evaluated for dry matter (DM), total nitrogen, total available carbohydrates and in vitro digestibility of DM. Animal gains, feed consumption and carcass grades were determined by feeding the silages to yearling Hereford steers and DM digestibility determined with sheep. The total yield and contribution of the ear increased from the first to the second harvestins date. The in vivo digestibility ofDM ofthe silages declined between the second ani final harvests in all years as did animal gain in years I and 3. The This agrees with the observations of Demarquilly (1969) in France and Daynard and Hunter (1915) in Ontario where temperatures would not be expected to be high during the corn maturation period. Cummins (1970)