Store ground beef in its original packaging in the coldest part of the refrigerator, where it will keep for one to two days. It may be frozen in this packaging for up to two weeks. For longer freezing, wrap the meat in heavy-duty aluminum foil, freezer paper, or freezer bags. Ground beef will keep three to four months in the freezer. Defrost it in the refrigerator, allowing 12 hours for thick hamburgers. Cook as soon as possible after defrosting.