Mayonnaise is one of those kitchen staples that makes almost everything a little better. Whether you're spreading it on a sandwich, mixing it into potato salad, preparing deviled eggs, or using it as the base for a creamy dressing, a jar of mayo is something many households always keep in the refrigerator.
But there's one question that often comes up after opening a jar: How long does mayonnaise actually last in the fridge?
Can you keep using it for weeks? Does it matter whether the jar is opened or unopened? And how can you tell when mayonnaise is no longer safe to eat?
The answers depend on the type of mayonnaise, how it was stored, and whether it has been exposed to bacteria or warm temperatures. With a few simple storage habits, you can keep your mayonnaise in good condition and avoid unnecessary food waste.
How Long Does Mayonnaise Last in the Fridge?
The shelf life of mayonnaise depends largely on whether it is commercially prepared or homemade.
Commercial mayonnaise is generally made with pasteurized eggs and ingredients that help maintain its quality. Homemade mayonnaise is different because it often contains raw or lightly cooked eggs and usually has a much shorter storage life.
Here are some general guidelines:
| Type of mayonnaise | Recommended storage |
|---|---|
| Commercial mayonnaise, unopened | Follow the printed date and storage instructions |
| Commercial mayonnaise, opened | Generally about 2 months in the refrigerator, according to common manufacturer guidance |
| Homemade mayonnaise | Generally 3–4 days when refrigerated promptly |
| Prepared egg or tuna salad made with mayonnaise | Generally 3–4 days in the refrigerator |
These are general guidelines, not guarantees that a product will remain safe for the entire period. Always follow the manufacturer's instructions and discard mayonnaise if it has been contaminated, stored improperly, or shows signs of spoilage.
How Long Does Unopened Mayonnaise Last?
