if your goin to feed the deer, from the moment you start, you CANNOT quit til the deer leave in the spring. The deer become dependent on hay if you feed them, and it can also mess up their digestive system. The bast way to go at it is to let the natural course take place, and if things become bad talk to someone from the DWR office, and if you have a large number of deer that winter on your ground, they will supply you with feed, but there has to be a good reason. They started too late for the deer last year.. I will tell you though, a landowner next to us had a lil barn of hay the deer could get in and it destroyed em.. I'm not tellin you not to or callin you an idiot, just put thought into it before you start feeding them.
REMEMBER> if you start feeding, feed all the way through til they can manage themselves in the spring.. if it were me I wouldn't unless they absolutely needed it..