In a lot of Southern kitchens, the cast iron skillet is the most valuable thing in the cupboard — not because of what it cost, but because of who used it before. A well-seasoned skillet can be passed down for generations, and it gets better with every pan of cornbread, fried chicken and seared pork chops.
The secret is seasoning: thin layers of oil baked onto the iron until they form a hard, slick coating. This guide explains how to season a cast iron skillet from scratch, how to clean it without damaging that coating, and how to bring a neglected pan back to life.
What "seasoning" actually is
When a thin film of fat is heated past its smoke point on iron, it goes through a process called polymerization. The oil breaks down and bonds into a hard, plastic-like layer that sticks to the metal. Each layer adds to the last. Over time, those layers fill in the microscopic texture of the iron and create a naturally nonstick, rust-resistant surface.
That is why seasoning is built up gradually — through oven sessions and, just as importantly, through regular cooking.
When you need to season
- A new, unseasoned pan. Most cast iron sold today comes pre-seasoned from the factory, so you can cook in it right away. Extra seasoning rounds will make it even better.
- A pan with rust, dull gray patches or food sticking badly.
- A secondhand skillet from an estate sale or thrift store, especially if it has been stripped, burned or neglected.
- After cooking something that removed seasoning, such as a long-simmered tomato sauce.
How to season a cast iron skillet in the oven
You will need the skillet, a neutral oil or shortening, lint-free paper towels or a cotton cloth, and an oven.
- Clean the pan. Wash it with warm water and a little dish soap, scrubbing off any food or rust. (More on rust below.)
- Dry it completely. Towel-dry, then set it on a burner over low heat for a few minutes until every trace of moisture is gone.
- Apply a very thin layer of oil. Use vegetable oil, canola oil or melted shortening. Rub it all over — inside, outside, the handle and the bottom.
- Wipe it off. This step is the one most people skip. Using a clean towel, wipe the pan as if you had used too much oil — because you almost certainly did. The pan should look dry, not glossy. Excess oil turns sticky and blotchy.
- Bake upside down. Place the skillet upside down on the center oven rack, with a sheet of foil or a baking sheet on the rack below to catch drips. Heat the oven to 450 to 500°F and bake for one hour.
- Cool in the oven. Turn the oven off and let the pan cool inside.
- Repeat. Three or four rounds make a strong base, especially on a stripped or very dry pan.
The pan should come out a deeper, more even black with a satin sheen. It may smoke during baking; open a window and turn on the vent fan.
Cleaning cast iron after cooking
Everyday cleaning is simple and fast.
- Clean while the pan is still warm. Food releases more easily.
- Rinse and scrub with hot water. Use a stiff brush, a pan scraper or a chainmail scrubber. For stubborn bits, scrub with coarse kosher salt and a little water.
- Soap is fine. A small amount of modern dish soap will not strip polymerized seasoning. The old warning dates from a time when soap contained lye. Just do not soak the pan.
- Dry immediately and thoroughly. Towel-dry, then heat on the stove for a minute or two.
- Oil lightly. While the pan is warm, rub in a few drops of oil and wipe it almost dry.
Cast iron maker Lodge has a clear, practical cleaning and care guide that agrees with this approach.
What to avoid
- The dishwasher. It will strip seasoning and cause rust.
- Soaking in water, even for an hour.
- Air-drying. Rust can form within hours.
- Storing with the lid on in a humid kitchen. Leave the lid off or tuck a paper towel inside to absorb moisture.
Fixing common problems
Rust
Scrub the rust off with steel wool, fine sandpaper or a scouring pad until you reach bare metal. Wash, dry thoroughly, and season in the oven two or three times.
Sticky or gummy surface
That is excess oil that did not fully polymerize. Bake the pan upside down at 450 to 500°F for another hour. If it is still sticky, scrub it lightly, then season again with a much thinner layer.
Flaking black bits
Small flakes usually mean old, carbonized buildup is breaking off. Scrub the loose areas and re-season. If the flaking is widespread, strip the pan completely and start again.
Food sticking
Some sticking is normal with a newer pan. Cook with enough fat, preheat the skillet properly, and cook fatty foods — bacon, sausage, cornbread with plenty of butter — in the early days to build up the coating.
The best foods for building seasoning
The easiest way to improve a skillet is to cook in it often. Good choices include:
- Cornbread, baked in a preheated, well-greased skillet
- Fried chicken and pan-fried pork chops
- Bacon and sausage
- Sautéed onions and greens
- Seared steaks
Acidic foods like tomatoes, wine or vinegar are fine in a well-seasoned skillet for a short time. Long, acidic simmers are better in enameled cast iron or stainless steel.
A seasoned skillet is ideal for the bacon and shrimp in our shrimp and grits recipe, and it is the only proper vessel for the cornbread on a Sunday supper table.
Buying secondhand cast iron
Old skillets turn up at estate sales and flea markets and are often lighter and smoother than new ones. Look for pans that sit flat without rocking, have no cracks, and are not badly warped. Surface rust and crusty buildup can almost always be fixed. Cracks and warps cannot.
Frequently asked questions
Which oil is best for seasoning?
Neutral oils with a relatively high smoke point — vegetable, canola or shortening — work well and are inexpensive. Some people like flaxseed oil, but it can be prone to flaking. The type of oil matters less than applying it very thinly.
How often should I season in the oven?
If you cook with your skillet regularly and oil it after cleaning, rarely. Oven seasoning is mostly for new, stripped, rusty or problem pans.
Can I use cast iron on a glass cooktop?
Generally yes, but lift rather than slide the pan, and check your cooktop manufacturer's guidance.
Photo credits: Cornbread in cast iron pan by Douglas P. Perkins, CC BY 3.0, via Wikimedia Commons; Griswold cast iron skillet by NMorales (WMF), CC BY-SA 4.0, via Wikimedia Commons.
