I just winterized mine here for Minnesota. Shrink wrap isn't going to
keep the boat a whit warmer, except when the sun heats it up and there
isn't enough ventilation to cool it off. This is usually not good.

I made a frame and covered it with canvas, but would swap in a minute
for a shed or other covered storage which would keep the snow, rain and
sun off, and let the humidity escape. Maybe next year.

Capt. Jeff