Whether or not you remove it for the winter depends on winter water conditions.  If you only get a thin layer of ice it will not affect the operation of the Air-Dock.  However, if you expect a “hard freeze” (such that you can walk on the ice) then we recommend removing the Air-Dock.  If you want to leave the boat on it, we recommend using bubblers or ice-eaters to prevent the water from freezing around it.  We also recommend being able to keep an eye on things, and not leaving your boat unattended for long periods.