Claire WhitakerBy Claire Whitaker

Updated November 2026

Seasoning a cast iron skillet in the oven takes about an hour and gives you a thin, hard, nonstick layer of polymerized oil bonded to the metal. You will clean the pan, apply a very thin coat of oil, and bake it upside down at a high temperature several times. The result is a pan that releases food more easily and resists rust. If you are new to this, our guide How to Season a Cast Iron Pan: A Step-by-Step Guide for Beginners covers the basics.

What You Need Before You Start

  • A cast iron skillet, cleaned of any old residue
  • Neutral oil with a high smoke point, such as flaxseed, grapeseed or vegetable shortening
  • Lint-free cloth or paper towels
  • A rimmed baking sheet or a sheet of aluminum foil for the bottom rack
  • Oven mitts

Step-by-Step: How to Season Cast Iron Skillet in Oven

  1. Clean the pan. Wash it with hot water and a small amount of dish soap, then scrub off rust or sticky spots with steel wool. Dry it completely, then warm it on the stove for a minute to drive off any moisture.
  2. Preheat the oven to 450°F to 475°F. Place a rack in the middle and put a foil-lined sheet on the bottom rack to catch drips.
  3. Apply a thin coat of oil. Pour a small amount of oil into the pan and rub it over every surface, inside and out, including the handle. Then wipe off as much as you can with a clean cloth. The pan should look almost dry. Too much oil leaves a sticky, uneven finish.
  4. Bake upside down. Set the skillet on the middle rack with the handle facing out. Bake for one hour.
  5. Cool in the oven. Turn off the oven and let the pan cool inside. This prevents thermal shock and helps the coating set.
  6. Repeat. Two to three thin layers produce a durable finish. Each layer adds hardness and slickness.

Choosing the Right Oil and Temperature

Oil choice affects how hard the finish becomes. Flaxseed oil polymerizes into a very hard layer, while vegetable shortening forms a softer coat that is easier to maintain. Many home cooks use vegetable oil or grapeseed oil because they are easy to find and perform well. Temperatures between 450°F and 475°F are usually enough to polymerize the oil without producing heavy smoke. Avoid going much higher, since that can cause a flaky, gummy surface.

Shopping for one? See our guide: 6 Best Cast Iron Skillets for Oven Use Compared (2026).

Caring for Your Seasoned Pan Afterward

Once the seasoning is in place, keep it intact by cleaning gently. Wash with warm water soon after cooking, dry thoroughly and wipe on a very light coat of oil. For more detail, see How to Clean a Cast Iron Skillet: 5 Steps That Protect the Seasoning. Cooking fatty foods regularly also builds seasoning over time.

Common Mistakes

  • Applying too much oil, which leaves a sticky surface
  • Skipping the foil, which lets drips burn onto the oven floor
  • Baking at too low a temperature, which yields a weak coating
  • Removing the pan while still hot, which can cause cracking
  • Using soap heavily or soaking the pan, which can strip new seasoning

A stiff-bristled brush or chainmail scrubber helps remove rust before you start. Flaxseed oil is a popular choice for a hard finish. A rimmed sheet pan or heavy-duty foil makes cleanup easier.

  • Chainmail scrubber for removing rust and debris before seasoning View on Amazon
  • Flaxseed oil for a hard, durable seasoning layer View on Amazon
  • Rimmed baking sheet to catch drips on the bottom rack View on Amazon

FAQ

How long does oven seasoning last?

A well-built seasoning layer can last for years with regular gentle cleaning. Harsh scrubbing or acidic foods can wear it down faster.

Can I season a cast iron skillet in oven without foil?

You can, but foil or a sheet pan on the bottom rack is strongly recommended. It catches oil drips that would otherwise bake onto the oven floor.

How many times should I season the skillet?

Two to three thin coats are usually enough to start. You can add more layers over time as you cook with fat.

Conclusion

Seasoning a cast iron skillet in the oven is a simple process: clean, apply a very thin oil coat, and bake upside down at a high temperature. Repeat for a durable, slick finish. Keep the pan dry and lightly oiled, and the seasoning will improve with use.

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Claire Whitaker

About Claire Whitaker

Claire Whitaker is part of our editorial team and reviews and edits our cookware & knives guides, checking product details against manufacturer specifications and owner feedback.