Answer: Covering your laurels will only help protect them from mild frost - a few hours of 32F. Colder temperatures or temperatures just at freezing for 4 or more hours will require more substantial frost protection; something that's difficult to do for large shrubs and small trees. I'd just leave the plants alone. Whatever frost damage they endure can be pruned away next month. Laurels grow fast and will regrow anything damaged during this unusually cold winter.
Best wishes with your landscape!
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