The cost of storing a modest, trailer able boat in a fenced field throughout the winter can range from a few hundred dollars to thousands of dollars for indoor boat storage, and tens of thousands for extremely big boats maintained in a wet dock. However, keep one more thing in mind. Most of the time, if you store your boat at an indoor dry stack facility, it will be there all year. So, if you pay for year-round storage, you won't have to pay for a wet slip during the summer, and your boat will be sheltered from the weather all year. In contrast, if you keep your boat in a wet slip permanently, you won't have to bother about locating and paying for winter storage separately. However, keep in mind that there will still be yearly haul-out costs for maintenance. here