Seasoning is the foundation of great cast iron cooking. It's what gives your skillet that legendary non-stick surface, protects it from rust, and builds the heirloom quality that makes cast iron worth passing down. Whether you're seasoning a brand-new skillet or restoring an old one, this guide covers everything you need to know.
What Is Seasoning?
Seasoning isn't a spice — it's a layer of polymerized oil baked into the surface of your cast iron. Each time you cook with oil and apply heat, that layer builds up, creating a naturally non-stick, rust-resistant surface that only gets better with age. This is why a well-used cast iron skillet outperforms a brand-new one.
What You'll Need
- Your cast iron skillet
- A high smoke-point oil (flaxseed, grapeseed, or shortening work best)
- Paper towels or a lint-free cloth
- Your oven
Step-by-Step: How to Season Cast Iron
Step 1: Wash and Dry Thoroughly
If your skillet is new, give it a quick wash with warm soapy water to remove any factory coating. For older pans, scrub off any rust or residue. Dry it completely — any moisture left behind will cause rust. Place it on the stovetop over low heat for a few minutes to evaporate every last drop.
Step 2: Apply a Thin Layer of Oil
Using a paper towel, rub a very thin layer of oil all over the skillet — inside, outside, and the handle. The key word is thin. Too much oil will result in a sticky, gummy surface instead of a hard, smooth seasoning layer.
Step 3: Bake Upside Down
Place the skillet upside down in your oven at 450–500°F (232–260°C). Put a sheet of foil on the rack below to catch any drips. Bake for one hour, then let it cool completely in the oven.
Step 4: Repeat
One round of seasoning is a start, but three to four rounds builds a truly durable base. Each layer adds depth and protection. After that, regular cooking with oil does the rest.
Best Oils for Seasoning Cast Iron
Not all oils are equal. You want a high smoke-point oil that polymerizes well:
- Flaxseed oil — creates a very hard, durable layer (best for initial seasoning)
- Grapeseed oil — high smoke point, neutral flavor, widely available
- Crisco/vegetable shortening — the classic choice, works great
- Avoid olive oil or butter — too low a smoke point, can go rancid
How to Maintain Your Seasoning
Once seasoned, cast iron is easy to maintain:
- Cook with oil or fat whenever possible
- Clean with hot water and a stiff brush — avoid soap for everyday cleaning
- Dry immediately and apply a light coat of oil after each wash
- Never soak in water or put in the dishwasher
Signs Your Cast Iron Needs Re-Seasoning
If your skillet looks dull, feels rough, shows rust spots, or food is sticking more than usual, it's time for a re-season. The good news: cast iron is nearly indestructible. Even a heavily rusted pan can be fully restored with a thorough scrub and a few rounds of seasoning.
Built to Last Generations
At Independent Ironware, every skillet we make is handcrafted in small batches right here in the USA. Our cast iron is built to develop a beautiful seasoning over years of use — the kind of heirloom cookware that gets passed down, not thrown out. Season it well, cook with it often, and it will reward you for a lifetime.