With a freezer that’s full, foods can stay frozen up to 48 hours. A half-full freezer can still keep food frozen up to 24 hours after the power goes out. Should the power stay off for several days, dry ice can preserve food in the freezer. If you have a picnic cooler, and time to make ice in your own refrigerator, fill the cooler before the storm hits. Try to resist the urge to look inside and check on the items in the refrigerator/freezer.