How hardy is a Boston fern
I've got a couple of Boston ferns, both in hanging pots; one I've had for half dozen years, but both are sizeable - and greenhouse space is getting scarcer every year. The Wiki entry says they are perennials in zones 9-11, and here in SE VA we are 8a but it hasn't gotten below 24F for several years.
I have a portable, 6x8' SL 'greenhouse' I put up for winter; it's heated just enough to keep from freezing, and unless i hear differently, the ferns are going in there for winter. I figure they may not like it, but it probably won't kill 'em....