Alexis, you may have more success in plant recuperation than many would expect. Much depends upon whether there was any cooling period prior to the cold snap. If they had a chance to acclimate then there should be minimal damage, but if it was a sudden cold without the plants experiencing a seasonal cool-down (below 60F) then there may be cause for concern. Also, plants wet or plants dry makes a big difference when the temp drops. In previous winters my diversity of "intermediate" and "warm" growers survived and thrived after several c.40F temps each season, when normal GH winter temps were often in the upper 50sF [still 50-70 degrees warmer than outside static air temps!].