Let’s explore how long Mayo is good after the expiration date. Besides this, discuss everything we need to know about Mayo storage.
Worried whether mayonnaise can be used past its use-нимиili loud date? Find out how long opened and unopened mayonnaise can be kept, ways to know it has gone bad, how to store it, and food safety matters.
Every family takes mayonnaise. It has a tendency to remain untouched in the fridge even after its expiry date. So what happens after that date? Is it safe to eat them? It depends on several important factors: is the jar is open or closed, how it will be stored, and whether it is spoiled or not. In the given article, we will tell the way in which long mayonnaise can survive past the expiration date, how to store it, and when one should dispose of it.

Understanding Expiration Labels
It’s essential to understand that expiration labels like “Best By,” “Sell By,” and “Use By” usually refer to the product’s peak quality—not when it becomes unsafe to eat. Many commercially processed foods remain safe to eat weeks or even months after these dates, depending on storage and handling.
For mayonnaise, which contains acidic ingredients like vinegar or lemon juice along with oil and eggs, this combination provides some natural preservation. This makes it more stable than you might think, but caution is still necessary.
Can Unopened Mayo Last?
Commercially produced mayonnaise that has been unopened can be kept three to four months beyond the printed date when stored in a cooldark place such as a pantry or refrigerator. That is because the ingredients used to create store-bought mayos tell you that the mayo lasts longer than homemade mayos do because they have to be fresher.
But it is a matter of conditions. A jar that has been subjected to overheating, humidity, or that has a ruptured seal must be discarded, no matter how ajar.
Opened Mayonnaise: What to Expect
Once you open a jar of mayo, proper storage becomes even more important. An opened jar kept consistently in the refrigerator at or below 40°F can remain safe for up to two months past its printed date. This estimate assumes proper handling: always use clean utensils to avoid contamination, and return the jar to the fridge promptly after use.
Leaving mayo out at room temperature for long periods raises the risk of bacterial growth, especially if the product contains eggs. Mayo left out for more than two hours should not be used again.
How to Tell If Mayonnaise Has Gone Bad
Regardless of the date, always inspect mayonnaise before consuming it. Trust your senses:
- Smell: If it has a sour, sharp, or rotten smell, throw it away.
- Appearance: Mayonnaise should be smooth and creamy. Any separation, discoloration, or visible mold is a warning sign to toss it.
- Taste: If you’re unsure and the smell and appearance seem fine, a small taste might help, but only if there are no other signs of spoilage. If the flavor seems off, don’t eat more.
Storage Tips to Extend Mayo’s Shelf Life
Properly storing mayonnaise is key to maximizing its safety and quality.
- Keep unopened jars in a cool, dry pantry or, ideally, in the refrigerator.
- Once opened, store the jar tightly sealed in the fridge.
- Avoid using dirty utensils that can introduce bacteria.
- Don’t store mayo in the refrigerator door, where temperatures change more; place it on a stable middle shelf instead.
Following these tips allows you to enjoy your jar safely, even past its expiration date.
Is Homemade Mayonnaise Different?
Yes. Homemade mayo is not pasteurized and lacks the preservatives found in store-bought versions. Thus, it has a much shorter shelf life. Even when refrigerated, homemade mayo should be used within three to five days. If it smells strange or changes texture, don’t eat it.

Food Safety Guidelines and Expert Advice
The USDA and FDA suggest that properly refrigerated, opened mayo is safe to consume for one to two months beyond its expiration date. The key is maintaining cleanliness and consistent refrigeration.
Consumer experiences support this advice. Many people report using Mayo a few weeks past its date with no problems, as long as it is kept cold and appears normal. However, the risk increases once opened, Mayo is exposed to temperature changes or contamination.
FAQs – How long is Mayo good after the expiration date
Q: Can I eat mayo that expired a month ago?
Yes, if it’s in a pack properly, it’s likely safe. Even after opening, as long as it has been consistently refrigerated and shows no signs of spoilage, you can probably still use it.
Q: What happens if I eat expired mayo that went bad?
You might risk food poisoning. Symptoms can include nausea, vomiting, stomach cramps, and diarrhea. If you think the mayo has gone bad, don’t take the risk.
Q: Why does mayo go bad even if refrigerated?
Every time you open the jar and use a utensil, you expose the mayo to air and bacteria. Over time, even when refrigerated, spoilage can occur.
Q: How can I avoid wasting mayo?
Buy smaller jars if you don’t use it often. Always store it correctly and label it with the date you opened it.
Q: Can I freeze mayonnaise to extend its shelf life?
Technically, yes, but it’s not recommended. Freezing mayo can break its emulsion and change its texture significantly, making it unpleasant to use after thawing.
Conclusion – How long is Mayo good after the expiration date
Mayonnaise can often outlast its printed expiration date by several weeks or even months if stored correctly. Unopened jars kept in a cool, dark place may still be acceptable three to four months past the label date. Once you open it, mayo in the refrigerator can remain safe for up to two months.
The most important rule is to trust your senses. If it looks, smells, or tastes off, don’t eat it. Proper handling and storage practices can ensure your mayo stays safe to eat, even after the date on the jar has passed.
If you’re ever uncertain, it’s always better to be safe. A new jar of mayo is a small price to pay compared to the risk of foodborne illness.