My 17’ fishing boat stays in the heated garage year round ready to roll.
For a 23.5’ tritoon (30’ coupler to prop) in an unheated pole barn with concrete floor at a buddy’s I pay him $300 cash in total. We have buildings a quarter mile down the road but they’re plump full with tractors, lifts, a lull, and so on.
I know locally there are a couple trucking outfits that charge $750 for a fishing boat for the winter with their extra space. These are nice buildings kept just above freezing and it stays until the contracted date, no access to take it in and out during winter