Lots of boats stay in slips all winter (with bubblers). In terms or really using them, I've seen boats in late November, early December. There's no specific requirement, other than your insurance company. Most of them have specified lay-up periods, if you use your boat and something happens during the lay-up period, you could be on your own
On another note, in terms of end of season, since today was the last day Jo Jo's was open, I guess it's official
