Some County Fairgrounds rent out their enclosed buildings for winter RV storage. Several East of the Cascades in my area are the Spokane County Fairgrounds, the Fairgrounds near Cusick, WA and in Deer Park, WA. Also, the former old Costco building on Sprague Avenue in Spokane rents parking spaces. Some rent by the foot for around $12/foot for a one time charge for the months of Oct. 1 thru March 25th. You can take your rig out and put it back in during the rental period, however, they do charge upwards of $75 each time. You do need to show liability insurance so for very little money I added my vintage camper to my car insurance policy.