Home – Questions and Answers 2 – Potato in Foil Can I prepare a baked potato in foil 4 hours before baking? Can I prepare a baked potato in foil 4 hours before baking? Since preparing a baked potato in foil takes just a few seconds, I would recommend you to prepare it just before baking. The potato tastes better that way. You can also bake the potato the day before and re-heat it for a few minutes the next day and it will be ready to eat.