Question: how to heat up a fully cooked ham in the oven?
Answer: Reheat in a 325-degree oven until it reaches an internal temperature of 135 to 140 degrees. You can also place the ham in an oven bag. Figure no more than 10 minutes per pound for reheating. For hams that are fully cooked (again, check the label) and not spiral sliced, first cut off any skin.