How to Season a Cast Iron Griddle: Step-by-Step
Recommended picks
Why Seasoning Matters for Outdoor Cast Iron
Cast iron is bare metal until you build a seasoning layer on it. Without that layer, food sticks, moisture gets in, and rust follows quickly, especially on an outdoor griddle that sees rain, humidity, and temperature swings. Seasoning is polymerized oil, meaning oil that has been heated past its smoke point until it bonds to the iron and forms a hard, slick coating. A well-seasoned griddle like the Bayou Classic 7428, which is rated 4.4 stars across 192 reviews and carries a 30.8 lb cast iron construction, cooks more evenly and cleans up with far less effort than an unseasoned one.
What You Need Before You Start
You need a high-smoke-point oil, paper towels or a lint-free cloth, heat-resistant gloves, and your griddle. The best oil choices are flaxseed oil (highest smoke point, around 225 degrees F, gives a hard initial season), grapeseed oil, or plain Crisco shortening. Avoid olive oil and butter for seasoning because they have low smoke points and leave a sticky residue. You also need a heat source, either a propane burner outdoors or an oven, that can sustain 400 to 500 degrees F for 30 to 60 minutes per coat.
Step-by-Step Seasoning Process
Start by washing the griddle with hot soapy water and a stiff brush to remove any factory coating or rust. Rinse completely and dry it immediately, then place it on your burner or in the oven for 10 minutes to drive off all moisture. Once dry and warm, rub a thin coat of oil over every surface, including the sides and bottom, using a folded paper towel. Wipe off as much oil as you can so only a thin film remains. Heat the griddle to 400 to 450 degrees F and hold that temperature for 30 to 45 minutes until the oil stops smoking and the surface darkens. Let it cool to warm, then repeat the oil and heat cycle two to three more times. For a propane griddle like the Royal Gourmet PD1301R, rated 4.5 stars across over 6,700 reviews, you can run this entire process right on the 8,500 BTU burner outdoors.
How to Tell When Seasoning Is Done
A properly seasoned surface looks dark brown to black with a faint sheen, not wet or greasy. If you press a paper towel on it and lift, the towel should come away nearly clean with only the faintest brownish tint. A shiny or sticky surface means the oil coat was too thick and needs another high-heat session to burn it through. The seasoning hardens more over time as you cook with it, so the first few cooks are part of the process, not a test of whether you did it right.
Maintaining the Seasoning After Each Cook
After each outdoor cook, scrape off food debris while the griddle is still warm, wipe it down with a paper towel, and rub a light coat of oil over the surface before storing. Do not soak cast iron in water and avoid harsh soap on a seasoned surface because both strip the polymerized layer. If you see orange or reddish spots, that is surface rust, and you can remove it by scrubbing with coarse salt and oil, then re-seasoning those spots. The cast iron Keesha Griddle and BBQ Grill Bag (4.2 stars, 17 reviews, cast iron material, propane-ready) stores compactly, which makes it easier to bring inside after a cook and away from overnight moisture.
Seasoning a Griddle That Has Gone Rusty or Sticky
If the griddle has significant rust, scrub it back to bare metal with steel wool or a chain-mail scrubber, wash it, dry it completely over heat, and start the seasoning process from scratch. A sticky or uneven surface usually means you applied oil too thickly on a previous session. The fix is simple: heat the griddle to 450 to 500 degrees F for 30 minutes to burn off the sticky layer, let it cool, and redo the seasoning with thinner coats. There is no permanent damage from a bad seasoning attempt, only more sessions until you get it right.
Common mistakes to avoid
- Applying too much oil at once, which bakes into a sticky, uneven layer instead of a hard coating.
- Not drying the griddle completely before the first coat, which traps moisture under the seasoning and causes rust bubbles.
- Using low-smoke-point oils like olive oil or butter, which go rancid instead of polymerizing.
- Stopping after one coat and expecting a fully nonstick surface, when four coats is the minimum for a durable base.
- Storing the griddle outdoors uncovered after seasoning, which exposes it to rain and humidity between cooks.
- Washing a seasoned griddle with dish soap regularly, which strips the polymerized oil layer over time.
Frequently asked questions
Can I season a cast iron griddle on a propane burner instead of an oven?
Yes, a propane burner works well for seasoning outdoor griddles and is often more convenient because you can do it outside where smoke is not a problem. Set the burner to medium-high heat and give it time to stabilize at 400 to 450 degrees F before timing your 30 to 45 minute hold. The Royal Gourmet PD1301R, for example, runs an 8,500 BTU burner that reaches and holds seasoning temperatures reliably.
How many coats of seasoning does a new cast iron griddle need?
Plan for a minimum of two to four thin coats before the first cook. Each coat adds a thin layer of polymerized oil that stacks on top of the previous one. More coats equals a more durable, more nonstick surface. After that, regular cooking with fatty foods like bacon or burgers continues to build the seasoning naturally over time.
What oil is best for seasoning cast iron?
Flaxseed oil, grapeseed oil, and vegetable shortening are the most commonly used options because they have high smoke points and polymerize well. Flaxseed oil is popular for initial seasoning because it bonds tightly to the iron. Avoid olive oil, coconut oil, and butter for the seasoning step because they smoke at lower temperatures and leave a soft, sticky coat rather than a hard one.
Will cooking acidic foods like tomatoes ruin the seasoning?
Acidic foods can break down a thin or new seasoning layer if they sit on the surface for a long time or are cooked repeatedly before the seasoning is well established. Once you have built up several solid coats, occasional acidic foods are generally fine. For the first few cooks on a freshly seasoned griddle, stick to fatty proteins to strengthen the base before moving to acidic ingredients.
How do I store a cast iron griddle between uses?
Store it in a dry location with a light coat of oil on the surface to block moisture. If you leave it outdoors, use a fitted cover rated for your griddle to block rain and condensation. Bringing it inside a garage or shed after each cook is the most reliable way to keep rust off cast iron that sees a lot of outdoor weather. For any questions about product care, you can also reach us at hello@thebbqgrill.com.