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Typically this is about 18 minutes per pound but Iâll sometimes pull mine out about 20 minutes before that since it will stay warm in the tinfoil (and even room temperature ham is MUCH better than dry)! Most directions for cooking a spiral sliced ham tell you to reheat your ham at 275F and I agree with this method.
1 Cooking a pre-cooked ham, such as a spiral ham, is very similar to cooking a fresh ham. 2  Place the ham in a roasting pan with water and cover it with foil. 3  Bake the ham at 325 degrees for 12 minutes per pound. 4  Pre-cooked hams are prone to becoming dry so be careful not to overcook.reheat the oven to 350 degrees Fahrenheit. Place the ham in a shallow roasting pan and add enough water to cover the bottom of the pan. Cover the pan tightly with aluminum foil.