I'm in Central NY and look for sheds every year.
I'm sure you know guys that have taken bucks in December that dropped their antlers already, My buck this year (taken Dec 16th) had dropped within a couple days of being shot. He had a serious foot/ankle injury though - which sometimes can make them drop early.
For me - I like to get out every thaw - after Mid January. Most deer in my area are shedding Jan15 - Feb15. Though a few times I've seen bucks with Anlters in March (not usually though). My problem is that - we usually have alot of snow- and even a big thaw - it won't all go, so if I check an area with snow, I always have to back to that spot when it melts completely. So - I only look for antlers in the winter in High Percentage spots - like apple orchards or Field Edges. I usually go back to these spots anyhow.
I get Serious in April before Green-up.
These were found in a clover plot in Late March a couple years ago.
FH