How to Season Cast Iron: Initial, Maintenance & Restoration Guide (2026)

How to Season Cast Iron Buying Guide

Photo by Abdullah Oguk / Pexels

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The Easy Guide On Seasoning and Restoring Cast Iron

This guide is for you if:

• You're equipping a kitchen and don't know which cookware material to buy

• You want to understand real-world differences between cast iron, stainless, and nonstick

• You've gotten conflicting advice about pans and want a clear, honest answer

Skip this guide if:

• You've decided on a material and just need the best brand — see our cookware comparison pages

• You're a professional chef — home cooking has different durability and cleaning trade-offs

## What Is Seasoning, Really?

"Seasoning" sounds like flavoring, but it has nothing to do with salt and pepper. Cast iron seasoning is a polymerized layer of oil baked onto the surface of the metal. Understanding this changes everything about how you season.

When oil is heated to high temperatures, its fatty acid chains cross-link and bond together in a process called polymerization. Instead of remaining a liquid oil, the heated oil converts into a hard, plastic-like polymer that bonds to the iron surface. This polymer layer is:

• Durable (sticks to the iron rather than rubbing off)

Every time you cook with cast iron — especially with oil or fat — you add infinitesimally thin new polymer layers. Every time you cook acidic foods or scrub too aggressively, you remove some. Seasoning is not a one-time event; it's a continuous process.

## The Science of Oil Selection

The single biggest controversy in the cast iron world is oil selection. There are strong opinions on flaxseed oil, Crisco, lard, grapeseed, and every other option. Here's what the science actually says.

The quality of a seasoning layer depends on how completely the oil polymerizes. Oils with a high proportion of polyunsaturated fatty acids (PUFAs) polymerize more completely and form harder, more durable seasoning layers. Oils with a high proportion of saturated fats polymerize less completely but form more flexible, resilient layers.

Flaxseed oil: Extremely high in PUFAs (particularly linolenic acid). Popularized by food science blogger Sheryl Canter as the best seasoning oil. Creates very hard layers. However, practical experience and follow-up testing have found flaxseed seasoning can be brittle and flake off with thermal stress. Not universally recommended anymore despite the theory.

Crisco (vegetable shortening): The Lodge factory standard. Balanced fatty acid profile creates flexible, durable polymer layers. Easy to apply in the correct thin amount. Works well for initial and maintenance seasoning.

Lard and tallow: Traditional choices before vegetable oils were widely available. High saturated fat content creates a more flexible (less hard) polymer layer. Very durable. Lard is what your grandmother's cast iron was seasoned with. Still excellent.

Grapeseed oil: High in PUFAs, high smoke point (420°F), relatively neutral flavor. A popular modern choice, performs similarly to flaxseed without the brittleness concerns.

Avocado oil: Very high smoke point (520°F), high PUFA content. Works well, particularly for high-heat seasoning bakes. More expensive than other options.

Canola oil: Widely available, decent PUFA content, 400°F smoke point. Fine for maintenance seasoning; works for initial seasoning but not the top pick.

Olive oil: Low smoke point (~375°F), mixed fatty acid profile. Fine for cooking, not ideal for dedicated seasoning bakes (can become sticky). Not recommended for initial seasoning.

Coconut oil: Very high saturated fat content, forms soft polymer layers that don't last as long. Use for cooking, not dedicated seasoning.

Crisbee Puck: A commercial seasoning conditioner made from beeswax, soybean oil, and palm oil. Pre-formulated for optimal fatty acid balance and application consistency. Convenient and effective, especially for maintenance.

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The Best Way To Clean and Season a Cast Iron Skillet | Epicurious 101

For initial seasoning: flaxseed, grapeseed, Crisco, or lard. All work. The difference between them matters far less than application technique (thin layers) and baking temperature and time.

For maintenance: whatever you cook with. The fat that renders from a bacon strip is seasoning. The butter you use for eggs adds seasoning. Regular cooking is the best maintenance.

## Initial Seasoning: Step-by-Step

This is for a brand new pan or one you've fully stripped down to bare metal.

• The cast iron pan

• High-smoke-point oil (grapeseed, flaxseed, Crisco, or lard)

• Aluminum foil or a baking sheet (to catch drips)

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Cast Iron Seasoning 101: How to Season, Maintain & Restore Your Skille

New Lodge pans come pre-seasoned from the factory, but the seasoning is thin and benefit from building up. If it's a new pan, wash with hot soapy water to remove any factory residue or shipping oil, then rinse thoroughly.

If this is a stripped/restored pan: wash, rinse, then dry completely on the stovetop over medium heat for 3-5 minutes until all visible moisture evaporates. Surface should look completely matte gray.

Critical: Cast iron must be completely dry before oiling. Water under the oil layer prevents proper polymerization.