Re: OK to Leave Empty Brood Boxes & Supers Outside This Winter?
If you leave them outside you will have moths, roaches, rodents, and what have you in those boxes. Take em downstairs and wrap them up with some paramoth crystals. Then, spend some time this winter to figure out what you need to change in order to keep your bees alive next year.
If the hives died already, my bet would be varroa mites and the viruses they vector. You said various reasons. Please elaborate.
Thankfully, the bees are smarter than I am. They are doing well, in spite of my efforts to help them.