Waxing your boat before winter storage is always a good idea. From a detailers perspective I always recommend having your boat waxed in the spring, mid season, and before storage. If you are on a budget, at least power wash or give your boat a good cleaning before putting the cover on for the winter. Waxing your boat before the winter protects your gel coat throughout the winter. Even though it’s under cover, it still is exposed to the elements and will get dirty. Also having your boat waxed, will make it that much easier for for you come spring.