Hi EmDem027,
to All Things Plants!
Ficus elastica (Rubber Trees):
http://garden.org/plants/searc... are pretty hardy so if they were only outdoors for one frigid night and the roots didn't freeze, they may very well recover. As has been stated, keep them in a warm spot with as much bright light as possible and away from any drafts and cold window panes. Water very sparingly the next few months; they may drop most or all of the leaves and look pretty pitiful but if there's still viable plant tissue, new growth will appear when the weather warms in spring and at that time you can re-pot in fresh potting soil and move them back outside to enjoy the sunshine.
