Store tenderloin 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 freezing, wrap the roast in heavy-duty aluminum foil, freezer paper, or freezer bags. Securely wrapped, the roast will keep six to twelve months in the freezer. Defrost the tenderloin in the refrigerator, allowing 4 to 5 hours per pound (445g), depending on size. Cook as soon as possible after defrosting.