I keep the herd in the house, the hoard in the garage. In the garage I keep them up off the floor on shelves where possible, but at least lifted off the concrete. My garage is fitted with a wood stove and I am out there working when I can so hopefully that keeps them out of the worst of the damp and colder weather. So far I haven't noticed a problem but many in the hoard came to me already rusted so if they rusted a bit more I wouldn't really notice.