BSK is certainly more qualified to answer this, but I will say I've seen more shedding earlier this year than most years…and on three large properties where I hunt across 3 adjoining counties in eastern middle TN. Two of the three have massive acorn crops, so it's not stress from lack of nutrition. A couple of guys from our largest lease keep their cameras running a lot later than I do. They've sent pics of at least 3 bucks having lost their antlers. Those pics were dated December 28 and January 2. You're right though, most years it's usually February through March.
I'll keep an eye out for a change. It's been a week since my most recent check, and it was only on one property. There weren't any shed heads yet on it. I have 4 other properties in 2 states I keep up with so I'll look for early shedding when I check them.