I haven't seen any bone here in weeks.

I see a few bucks every year that still have their antlers during the middle of March.

As I was cooking on the grill Monday night I let my dog go for a run around my property.  She had been gone for a few minutes and returned with a nice four point half rack.  She was pretty pleased with herself as  she pranced around the garage with the antler in her mouth.  I take her with me shed hunting and she normally finds more than I do.  
Al

I've seen several still carrying in early April, and when I do most of my serious looking (March) I always see several bucks carrying.