Hi Paul! That's a tough question to answer...
My plants are still outside and it has been getting down to 50ºF here at night. However, they're all packed in close together, next to the wall of my apt building, so I think they're staying warm enough. Also, there's no wind or rain (dead calm) to stress them out, and it's been sunny and upper 70's/low 80's during the day... So far, they're doing just fine.
I don't think I'd leave any "babies" out though (my outdoor 'biscus are all HUGE).
Deb