It has been quite some time since we have seen weather conditions this cold, and below freezing this long. If you have palm trees, tropicals and even sub-tropicals here is something you can do that may help them survive. Cover them entirely with blankets and if possible electric blankets next lite oil pots around the plants to aid in temperature increase and of course irrigate prior to the event. Knowing palms like I do and experiencing the 1983 freeze, it doesn’t appear that we wold have any different outcome, but it sure would help doing the above in reducing the mortality then doing nothing at all.