The freezer time shown is for best quality only - lamb chops that have been kept constantly frozen at 0°F will keep safe indefinitely. How long do raw lamb chops last after being frozen and thawed? Lamb chops that have been defrosted in the fridge can be kept for an additional 3 to 5 days in the refrigerator before cooking; lamb chops that were thawed in the microwave or in cold water should be cooked immediately. How long do lamb chops last in the fridge once they are cooked? Cooked lamb chops will usually stay good for 3 to 4 days in the fridge and 4 months in the freezer. How to tell if raw lamb chops are bad? The best way is to smell and look at the lamb chops: signs of bad lamb chops are a sour smell, dull color and slimy texture; discard any lamb chops with an off smell or appearance.