I gotta tell ya, Hippie, I've never seen a light frost damage plants, Ive harvested in 3 inches of snow before, ask anyone who's grown in New England, Canada, Alaska, anywhere cold any 99 of 100 will tell you a little frost won't hurt a thing.
Just keep a close eye on it, if the growing has stopped, kill it, if not, let it go....
Good luck, and happy smokes....
Anyway you could hook me up with a link to the info on frost you found? I'm very interested in reading this persons views on late season growing...