How to Season a Cast Iron Skillet

Cast iron seasoning is baked-on oil that has gone through polymerization, and the oven temperature matters more than which oil you grab first. Lodge, Field Company, Smithey, and America’s Test Kitchen each publish their own oven-seasoning steps, and none use the same number: Lodge bakes at 450 to 500°F, Smithey holds a flat 450°F, Field Company climbs in three stages to 400°F, and America’s Test Kitchen goes to 500°F when rebuilding a badly rusted pan. This guide lays out those numbers, the only two oils with a published smoke point, and what to do about rust. The Practical Choice does not season cookware in its own lab; the steps come from each brand’s published pages and America’s Test Kitchen’s tested methods. See how we score for the method.

What Oven Temperature Should You Use to Season a Cast Iron Skillet?

There is no single correct number: the four sources below range from 200°F to 500°F, depending on whether the goal is a quick touch-up or a full rebuild.

• Lodge: 450 to 500°F, pan upside down on the center rack, bake 1 hour, cool in the closed oven (Lodge Cast Iron).
• Smithey Ironware: a flat 450°F for 1 hour, then cool completely (Smithey Ironware).
• Field Company: graduated: 200°F for 10 minutes, 300°F for 10 minutes, then 400°F for a full hour, plus another hour cooling (Field Company).
• America’s Test Kitchen: 500°F for 1 hour, repeated six times, but only for a full strip-and-reseason on bare metal (America’s Test Kitchen).

For a routine refresh, 450°F for 1 hour (Lodge or Smithey’s number) covers most kitchens. Save the repeated 500°F bakes for a pan you have already stripped down.

How to Season a Cast Iron Skillet in the Oven, Step by Step

1. Wash and dry completely. Warm, soapy water is fine; a small amount of dish soap does not strip factory seasoning (Lodge Cast Iron; Smithey Ironware).
2. Apply a very thin coat of oil. Field Company measures this precisely: about 1/8 teaspoon for the cooking surface and 1/4 teaspoon combined for the bottom and handle (Field Company). Lodge’s version: a thin layer inside and out, not enough to drip when tilted (Lodge Cast Iron).
3. Wipe off the excess until the pan looks dry. Field Company calls this the key step: the surface should end up dull and matte, not glistening (Field Company).
4. Bake upside down on the center rack at 450°F for 1 hour, with foil on the rack below to catch drips.
5. Turn off the oven and let the pan cool inside it. Opening the door early can keep the seasoning from fully bonding (Lodge Cast Iron; Smithey Ironware).

What Oil Should You Use for Seasoning Cast Iron?

Only two oils have a published smoke point in the sources checked for this guide, and they point in opposite directions: grapeseed oil holds up under heat, flaxseed oil does not.

Flaxseed’s 225°F smoke point is roughly half of grapeseed’s, the chemical reason its seasoning flakes the first time you sear a steak in it (Field Company).

How Many Coats of Oil Does Cast Iron Need?

One thin coat per bake is standard, not a stack of layers in one session. Field Company, Lodge, and Smithey all describe a single wiped-down coat before each 1-hour bake; strength comes from repeating the process over time and cooking with fat regularly.

The exception is a full rebuild. America’s Test Kitchen reseasons a bare-metal pan with a fresh coat (1 tablespoon for a 12-inch skillet, 2 teaspoons for a 10-inch one), bakes at 500°F for 1 hour, cools, and repeats that cycle six times before the surface reaches a dark, smooth finish (America’s Test Kitchen).

What to Do About Rust on a Cast Iron Skillet

Light surface rust does not mean the pan is ruined. Smithey Ironware’s fix: scrub it away with steel wool or a chainmail scrubber and soapy water until all visible rust is gone, then dry and reoil (Smithey Ironware). One Amazon reviewer of a Lodge skillet described the same pattern in practice: “Not doing it, or leaving the pan damp, can result in rust quickly forming on the raw iron. However, even this is not a disaster as a gentle scrub and re-oiling will get rid of the rust.” (Amazon customer review, Lodge Cast Iron Skillet listing, Sep 2015)

For a heavily rusted or neglected pan, America’s Test Kitchen goes further: rub with fine steel wool to clear loose dirt and rust, heat vegetable oil in the pan over medium-low heat for about 5 minutes, add salt to form a paste, and scrub with paper towels while wearing a glove. Repeat until slick and black, then rinse, dry, and coat with a thin film of oil (America’s Test Kitchen).

Cast Iron Seasoning Mistakes to Avoid

• Reaching for flaxseed oil. Its 225°F smoke point is the lowest here, and the seasoning it produces is brittle and prone to flaking (Field Company).
• Pooling oil instead of wiping it off. A glistening surface, not a dry matte one, causes a sticky finish (Field Company).
• Baking too cool or too briefly. One Amazon reviewer of a Lodge skillet put it plainly: “There are two mistakes people make when seasoning: not hot enough, not long enough. These mistakes give the same result: a sticky brown coating that is definitely not non-stick.” (Amazon customer review, Lodge Cast Iron Skillet listing, Nov 2007)
• Cooking acidic food in a brand-new pan. Lodge warns tomato sauce, wine, and citrus can break down fresh seasoning (Lodge Cast Iron).
• Avoiding soap out of habit. Lodge and Smithey both say a normal amount of dish soap will not strip built-up seasoning (Lodge Cast Iron; Smithey Ironware).

When to Fully Strip and Reseason a Cast Iron Skillet

Strip and reseason when normal cleaning and a touch-up bake no longer fix the surface: widespread flaking, heavy rust, or a dull patina that will not respond to a single reseasoning session. America’s Test Kitchen’s method: spray the pan with Easy-Off Oven Cleaner while wearing rubber gloves, seal it in a heavy-duty trash bag, and leave it outdoors for 24 hours. Scrub with steel wool and hot soapy water, rinse, then soak in 2 cups distilled white vinegar plus 2 cups water for 30 minutes to 1 hour. The pan rusts almost instantly once dried, so oil goes on immediately, followed by the six-round, 500°F reseasoning cycle above (America’s Test Kitchen).

If a skillet is warped, cracked, or the handle is loose, stripping will not fix it. The Best Cast Iron Skillets of 2026 uses the same published-spec, brand-page, and named-tester method as this guide to compare what is sold new right now.

FAQ

Do I need to season a brand-new Lodge or Field skillet before cooking?

No. Both ship pre-seasoned: Lodge with Kosher-certified soybean oil, Field Company with three coats of grapeseed oil (Lodge Cast Iron; Field Company).

Can I use soap to wash cast iron?

Yes. Smithey and Lodge both say a small amount of dish soap is fine and will not strip seasoning (Smithey Ironware; Lodge Cast Iron).

Why does my seasoning come out sticky instead of smooth?

Usually too low a temperature or too short a bake, described by one Amazon reviewer as “a sticky brown coating that is definitely not non-stick” (Amazon customer review, Lodge Cast Iron Skillet listing, Nov 2007).

What is the fastest fix for light rust?

Steel wool or a chainmail scrubber with soapy water until the rust is gone, then dry and reoil (Smithey Ironware).

Does any cooking oil work, or do I need a specific one?

Any fat works while cooking. For a dedicated oven session, Field Company’s data favors grapeseed or sunflower oil over flaxseed oil and saturated fats (Field Company).