Cold temperatures

What is the minimum temp that sativa plants can survive there is a cold front coming so i want to know if it can handle the cold thats coming tonight it will be 49' f. But by saturday 36' f.

What do i do..?

wrap em up in burlap and hope for the best. peace

76 is ideal

Shouldn't be too bad as long as it isn't for a prolonged time. Also i think it has to do with how far along the grow is. Keep in mind though i am by no means an expert.