Cast Iron vs. Stainless Grates

Cast iron absorbs a lot of heat and gives it back to the food evenly, which is why steakhouse-style marks are easiest on cast iron. The catch is that bare iron needs a layer of polymerized oil (seasoning) to resist rust and sticking. Without it, a grill near the coast will show orange rust within days.

Care: Brush while hot after cooking. Wipe on a very thin layer of high-smoke-point oil while the grates are still warm. Never soak them, never put them in a dishwasher, and avoid soap soaks. If they rust, scrub the rust off with a wire brush, wash, dry on the hot grill, and re-season with a few thin coats of oil.

Many freestanding grills ship with these: cast iron covered in a glassy enamel coating. You get most of the heat retention without needing to season. The weak point is the coating. Metal scrapers, wire brushes and dropping the grates chip it, and once moisture reaches the iron through a chip, rust spreads underneath and the coating flakes off in patches.

Care: Use a nylon or brass-bristle brush, or a wooden scraper. Soak in hot soapy water for heavy buildup. Don't bang them on the ground to knock debris off. When chips start spreading and food sticks to the rough spots, it's time to replace them.

Most premium built-in grills come with stainless grates, often heavy hexagonal or diamond-shaped bars that hold heat well and sear better than thin round rods. Stainless doesn't need seasoning, tolerates wire brushes, and holds up to salt air far better than iron. Food can stick more on new stainless until a little residue builds up, and thin stainless rods can warp over years of very high heat.

Care: Brush hot after cooking. For a deep clean, soak in hot water with a biodegradable degreaser and scrub. Discoloration (gold or blue tints) from heat is normal and harmless. Avoid steel wool, which leaves iron particles that rust. More in our stainless care guide.

Grates are one of the easiest parts to replace and one of the best upgrades for an older grill. When ordering, you need exact dimensions (each grate's width and depth) and ideally the grill's model number. Our guide on finding the model and serial number helps, and OEM vs. universal parts explains the trade-offs between factory and aftermarket grates. Many premium-brand stainless replacement grates outlast the originals on lower-cost grills.

If you're not sure what fits, a tech can measure during a cleaning or repair visit and bring the right set.