As lamb chops may vary in size, use a meat thermometer to check for doneness. The internal temperatures are as following: Medium rare is 125° F Medium is 135° F Medium-well at 145° F Well-done 150-155F° Please note, cooking level of lamb chops is like any other meal a personal preference. It is advised though that lamb chops cooked past medium-well often brings out a more gamey taste and can make the meat less tender.