To season a cast iron skillet, coat it with a very thin layer of high-smoke-point oil, wipe off the excess, and bake it upside down at around 450 to 500F for an hour, then let it cool in the oven. Seasoning is a baked-on layer of polymerised oil that makes cast iron naturally nonstick and rust-resistant. Repeat a few times to build a base, and maintain it by oiling lightly after each use. This guide explains how to season cast iron step by step.
Rub a very thin layer of high-smoke-point oil over the clean, dry skillet, wipe off the excess, and bake upside down at 450 to 500F for an hour, then cool in the oven. Repeat to build the layer; oil lightly after each use.
What Seasoning Is
Seasoning is a layer of oil that has been baked on until it polymerises into a hard, slick coating. It is what makes bare cast iron nonstick and protects it from rust. It builds up over time with use and care.
How to Season a Cast Iron Skillet: Steps
- Wash the skillet with warm water (and mild soap if new or sticky) and dry it completely.
- Warm it briefly on the stove to drive off any moisture.
- Rub a very thin layer of high-smoke-point oil (such as grapeseed, canola or flaxseed) over all surfaces.
- Wipe it back off until it looks almost dry; excess oil makes it sticky.
- Bake upside down in a 450 to 500F oven for one hour, with foil on the rack below.
- Turn off the oven and let the skillet cool inside.
- Repeat two or three times to build a solid base layer.
Key Takeaway: The number one seasoning mistake is too much oil. A thick coat turns sticky and tacky, not slick. Wipe the pan until it looks almost dry before baking, and build the layer up over several rounds.
Best Oils for Seasoning
Use a high-smoke-point oil such as grapeseed, canola, vegetable or flaxseed oil. Avoid butter and olive oil, which have low smoke points and can go sticky.
Maintaining the Seasoning
- After cooking, clean with hot water and a brush or non-abrasive sponge.
- Dry the skillet completely, ideally on the stove.
- Wipe a thin layer of oil over it while warm.
- Cooking fatty foods naturally builds seasoning over time.
For full care, see best cast iron skillets.
Common Mistakes
- Using too much oil (sticky, tacky surface).
- Not drying the skillet fully (rust).
- Using low-smoke-point oils like butter.
- Skipping the wipe-off step before baking.
FAQ
How do you season a cast iron skillet?
Rub a very thin layer of high-smoke-point oil over the clean, dry skillet, wipe off the excess, and bake upside down at 450 to 500F for an hour, then cool in the oven. Repeat to build the layer.
How often should you season cast iron?
Do a few rounds when new or if it looks dull, then mainly maintain it by oiling after each use. Cooking fatty foods keeps the seasoning building.
What oil is best for seasoning cast iron?
High-smoke-point oils such as grapeseed, canola, vegetable or flaxseed oil. Avoid butter and olive oil, which have low smoke points.
Bottom Line
Season a cast iron skillet with a very thin layer of high-smoke-point oil baked on at high heat, repeated to build a base, then maintained by oiling after each use. Done right, it becomes naturally nonstick and lasts a lifetime. See our best cast iron skillets guide.
