I know this is just captive raised whitetails in this instance I speak of, but...I have found that many of my bucks shed literally the same day each year. Once theyre mature, it seems like some shed every say, February 20th, two or three years in a row, regardless of weather, what the other bucks did, etc. Also, some of my bucks are already showing a good 3/4 of an inch of new growth, too. Like PA trophyman said, it depends on the buck.