Not much, really
My H23.5 spent the first 7 years in Vancouver where it is relatively mild. For the last 5 winters it has just sat outside on the trailer on my lake lot 60 miles north of Calgary. The temperature dips to -30F at times.I take the outboard home and put it in my attached but undeated garage where it probably doesn't go below 0F.I empty the boat except for cushions, fenders, docklines, life jackets, boat hook, whisker pole, etc.The jib comes off the furler and into the bag which either goes in the boat or in the house. I wrap and tape a plastic garbage bag around the furler drum.The mast stays up. The boom comes off with the main still flaked into it, and it goes into the boat.I leave the water ballast value open as the manual suggests.I have canvas (sunbrella) winch and companionway covers.That's about it other than to say I don't know how much longer I can put up with a 4 month sailing season....RickM...