Not EVERY time, but sometimes.  It froze here a few days ago, and we covered our lettuce up with some heavy plastic to insulate it a smidge.  However, it still received some burnt spots here and there.  The arugula is especially suffering.  I don’t know what it’s problem is.  Some bugs must be eating it, because there are tiny little holes here and there on some of the leaves.  Whateve’s, who likes arugula any way?  And do I have pictures today?  No, I do not.  Please use your imagination, and I’ll see what I can’t do for the future.  Until then readers…FANS…keep it rockin’.