We are in northern Maine and have a real good place for ducks with the brook directly behind our house, where all 9 are sleeping atm. Without going into detail about our setup again, in the winter I let the ducks out into their run every day temps are over 0 F and they get a pool (old green turtle sandbox) filled up which lasts 5 or 6 hours before I bring it back in the cellar after banging the ice off it. 2 or 3 at a time they all take a bath, frolic around then preen and oil up. They stay in beautiful shape all winter but it takes a lot of time which I fortunately have.