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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 Spiral Sliced Hams. 2  These hams are delicious cold, but if you want to reheat them, the instructions are on the package. 3  Place the ham, cut-side-down, on heavy-duty aluminum foil and wrap the ham thoroughly. 4  Or use an oven roasting bag; follow instructions on the bag for preparation. The best way to do this is to place the ham on a rack in a roasting pan. 2  Add water to the bottom of the pan and cover the whole thing tightly with foil. 3  Bake at 325Â°F for 18-20 minutes per pound, until a meat thermometer registers 140Â°F.