Ideally, if you use your grill on a regular basis throughout the winter, the grates will not corrode. But if you don’t plan to use your grill during the winter, it’s always a good idea to store it in a garage. If you have a gas grill, be sure to completely disconnect the propane canister. Of course, you should brush and oil the grill grates before shutting down the grill for the season. To restore corroded grates, follow the instructions above for cleaning a rusty grill.