Well, I can't tell where the plant is in the pot, so I think it's gone.
I have taken the other VFTs out of the fridge. They're in the windowsill for now.
As for keeping them outside, well, here were the temps in December when I finally brought them in:
It took 2 days for the pots to thaw out inside enough to get the plants out of them. I don't think even mulching would have helped.
My thought at this point is burying a quarter wine barrel planter and using that as a minibog. We'll see how that works.