If they didn't sprout yet and the soil didn't freeze they should.* If they sprouted and the leaves and stems have blackened, I suspect they won't survive.* You could also use old sheets or blankets for cover.* I suspect visqueen is a type of plastic.* I don't recommend using plastic because your plants can get cooked if the sun comes out and the plastic isn't removed.
Newt
When weeding, the best way to make sure you are removing a weed and not a valuable plant is to pull on it. If it comes out of the ground easily, it is a valuable plant.