They should be fine, just perhaps a bit delayed. I find pupa in my "hibernated" worms (stored in refrigerator) because when I bring them out every couple of weeks to warm, wake and hydrate some also decide it's time to pupate....I find them the next time I pull the bin out, toss them in the pupa drawer (if I need more beetles....if not they get fed to the flock) and they develop from there. It's pretty hard to kill them short of extended actual freezing....I’m just starting out with a 3 drawer self sorting system... praying my Pupae make it to beetles ATM because winter hit last night and we now have a foot of snow... my trailer got down to 4 degrees Celsius last night.Not the best environment for my worms I think