I believe I heard from a deer farmer who said it can vary from each individual buck. I think there is some truth to this, as just this year around the end of June, I saw a buck on trail cam around 140" and looks to be almost finished, he may add a little more height, while many other older bucks were just starting to fork their main beams and G2s. I'm sure there is a general average, but I think some bucks start earlier or later than others for whatever reason.
