Why Is My Cast Iron Skillet Rusting? Causes and Fixes

Quick Answer

Rust on your cast iron skillet is almost always caused by moisture exposure after cleaning or during storage. The fix is to remove the rust with a mild abrasive, re-season the pan, and adjust your drying and storage habits to keep it dry.

You open your cabinet and find an orange patch on your favorite skillet. Rust on cast iron is frustrating, but it's also one of the most common and fixable issues home cooks face. The good news is that a little rust doesn't ruin the pan—it's just a sign that the protective seasoning has been compromised and moisture has reached the bare iron.

In this guide, we'll walk through the typical causes of rust, how to remove it, and the steps to prevent it from coming back. We'll also point out when a rusty skillet is beyond home repair and what your options are.

What Causes Rust on Cast Iron?

Rust forms when iron is exposed to oxygen and moisture over time. Cast iron skillets are especially vulnerable because they're made of raw iron, and their seasoning—a polymerized oil layer—is what protects them from rust. When that seasoning wears thin or is damaged, moisture can reach the metal and oxidation begins.

The most common causes are leaving the skillet wet after washing, storing it in a damp environment, or putting it away while still slightly damp. Acidic foods cooked for long periods can also strip seasoning, exposing the iron underneath. Even high-heat cooking can burn off seasoning if the pan is empty or overheated.

Another overlooked cause is putting a cast iron skillet in the dishwasher. The combination of water, detergent, and prolonged moisture strips seasoning and promotes rust. Similarly, soaking the pan in water for an extended time—even just 20 minutes—can be enough to start the process.

• Dry your skillet immediately after washing, then warm it on the stove to evaporate any remaining moisture.
• Store in a dry, well-ventilated area, not in a sealed cabinet that traps humidity.
• Avoid dishwasher and long soaks—hand wash only.

How to Remove Rust from Your Cast Iron Skillet

For light rust, you can often remove it with a gentle scrub using a non-abrasive scouring pad and warm water. If the rust is more stubborn, a paste of baking soda and water or a dedicated cast iron cleaner works well. The key is to scrub until the orange is gone and you see bare, gray iron.

After rust removal, rinse and dry the skillet completely. Then apply a thin layer of cooking oil—like vegetable or grapeseed—and heat the pan on the stove or in the oven to re-season it. This restores the protective barrier and prevents future rust.

If the rust is deep and pitted, you might need to use a more aggressive method like steel wool or an electric sander, but that's rare for most home cooks. In that case, consider whether the pan is worth the effort or if it's time to replace it.

• Always dry your skillet thoroughly after washing, then apply a light coat of oil before storing.
• If rust persists after scrubbing, repeat the process or consider a more abrasive approach.
• After re-seasoning, your skillet should look dark and smooth again.

When to Stop and Consider a New Skillet

Most rust is surface-level and easily fixable. However, if your skillet has deep pitting, cracks, or warping, it may be beyond home repair. Deep pitting can create rough spots that are hard to clean and may harbor bacteria. Cracks and warping compromise the pan's structural integrity and heating performance.

If you're dealing with a vintage or heirloom piece, you might still want to restore it, but for a modern skillet, it's often more practical to replace it. Smithey skillets are built to last a lifetime, but if yours has seen extreme damage, a new one is a worthwhile investment.

Remember, a little rust isn't the end of the world. With the right care, your skillet can serve you for decades. If you're consistently dealing with rust, it's a sign to adjust your routine—not to give up on cast iron.

Diagnosis: Is Your Skillet Rusty or Ruined?

• Symptom: Orange or brown patches on the cooking surface, often with a rough texture. If the rust is only on the surface and the pan is otherwise solid, it's fixable.
• Likely Cause: Moisture exposure after washing, storage in a damp area, or stripped seasoning from acidic foods or dishwasher use. Identify the cause so you can prevent it from recurring.
• Corrective Action: Scrub off the rust with a mild abrasive, dry thoroughly, and re-season with a thin layer of oil and heat. After re-seasoning, your skillet should look dark and smooth again.
• Stop or Choose Another Option: If the skillet has deep pitting, cracks, or warping, home repair may not be safe or effective. Consider replacing it. A new Smithey skillet is a reliable choice if your current pan is beyond repair.

Smithey Skillets Built to Last

• No. 10 Skillet: The No. 10 Skillet has all the features of a traditional Smithey skillet – pour spouts, a helper handle for lifting with two hands, and our signature polished interior that is easy to clean and maintain. A polished interior is smoother, which means seasoning adheres better and rust has fewer places to take hold. It also makes cleaning easier, so you're less likely to leave residue that attracts moisture.
• No. 8 Chef Skillet: The smaller shape and curved interior sides promote movement and flipping, while the longer handle keeps your hands farther away from heat. Like all Smithey skillets, the interior features a smooth, polished finish that, when seasoned, is naturally non-stick. The curved sides make it easy to toss food, and the polished finish is a practical choice for everyday cooking. A well-seasoned, smooth surface is your first defense against rust.

Rust on cast iron is a common issue, but it's rarely a dealbreaker. With a little elbow grease and proper re-seasoning, your skillet can be back in action. And if your pan is truly beyond repair, a new Smithey skillet is built to last—just remember to keep it dry.