The best protection for your plants that are outside in pots is watering. Dry plants will die in a freeze, watered plants will be more likely to survive. So, go out and check all the potted plants and make sure they are moist.
Keep the plastic gallon jugs that vinegar and milk come in and use them for watering outside. We keep four of them full of lightly fertilized water by the back door so it is always convenient to grab one and water the potted plants when they look dry.