The earliest I ever had one rub out was August 15th one year. This year it looks like over half of my bucks still have a week or two of growing to do yet, their tips are still pretty clumped up and pumping blood.
I did have a two year old buck bump the fence this past weekend are rip some velvet in a couple spots, I thought I would have to dart him and clean it, but it dried up fast and healed. I know he is close to finishing up.