Store rib roast in its original packaging in the coldest part of the refrigerator, where it will keep for three to four days. It may be frozen in this packaging for up to two weeks. For longer storage, wrap the meat in heavy-duty aluminum foil, freezer paper, or freezer bags. Rib roast will keep six to twelve months in the freezer. Defrost the roast in the refrigerator, allowing 4 to 7 hours per pound (445g). Cook as soon as possible after defrosting.