1 Heat oven to 325 degrees, remove roast from fridge; pat dry. 2  Arrange on a rack in a roasting pan, skin side up and place in the oven. 3  Roast to an internal temperature of 150 degrees, about 2 Â¾ to 3 hours. 4  When meat is done, raise oven temperature to 450 degrees for 15 minutes to crisp the skin.