In this part of the world, we can get into sub-freezing temperatures starting any time now. While we can get some nice weather, the Great Lakes tend to get pretty rough into the Fall and early winter.
When we go out, we wear full flotation suits, toques and gloves or mitts. We also wear winter boots as I find it's my feet that get coldest. We leave them loosely laced in case they need to come off in a hurry. Mrs. Stoo has a suit which is a size larger than she needs so she can stuff about 6 layers underneath.
In a few weeks, I will start to bring my batteries inside and leave a trickle charger on them. Also, when I pull my boat out, I turn the engine over for just a second to make sure there's no water stuck in it anywhere. Similarly, drop your trucks (well, the boat's) and remove the drain plug in the hull. You don't want any water trapped where it can freeze.
Usually, our season comes to an end when the first major snow comes. The ramps (slipways) get piled in with snow and there's always the risk that you will launch your truck too!
A few years ago we were up north to get in one last weekend of diving. We stayed in a motel the night before, but when I got up in the morning, my boat was filled to the top of the tubes with snow. I learned that dive fins actually make pretty good snow shovels!
When we got the the parking area near the ramp we had some trouble though because as we tried to back up, the surge brakes kept activating. We could have "pinned" them to get around that problem, but then I started to wonder if I'd be able to get my truck up the ramp again. Mrs. Stoo was beginning to protest and eventually prevailed. She's a sensible woman at times.