How Long Does Mayonnaise Last in the Fridge? Storage, Spoilage, and Safety Guide

How Long Does Mayonnaise Last in the Fridge? For an opened jar of commercially prepared mayonnaise, a practical refrigerated storage guideline is about two months when you keep it consistently cold and handle it properly. Homemade mayonnaise has a much shorter life, especially when it contains eggs, and should generally be treated as a short-term refrigerated food.

That difference matters because commercial mayonnaise and homemade mayonnaise are not the same product. Commercial versions usually use pasteurized eggs or egg products and undergo controlled manufacturing. Homemade mayonnaise, however, may contain raw eggs and lacks the same processing steps.

Storage conditions also make a major difference. A jar that stays cold and receives only clean utensils can remain usable longer than one that repeatedly sits on the counter during meals. Likewise, a printed date does not tell the whole story. You should also consider when you opened the jar, whether it stayed refrigerated, and whether its color, odor, texture, or container has changed.

Current federal food-storage guidance lists opened commercial mayonnaise at about two months in the refrigerator. In addition, guidance for homemade mayonnaise made with pasteurized eggs recommends refrigeration and use within four days.

I once found a nearly full jar of mayonnaise pushed behind several containers in the refrigerator and realized I could not remember when I had opened it. The date on the lid still looked reasonable, but that did not answer the more important questions. Had it been open for two weeks or two months? Had someone left it on the counter during a picnic lunch? I eventually discarded it because the storage history was unclear. Since then, I write the opening date on the lid. That small habit has made the question of whether mayonnaise is still good much easier to answer.

How Long Does Mayonnaise Last in the Fridge After Opening?

Commercial Mayonnaise Usually Keeps About Two Months

How Long Does Mayonnaise Last in the Fridge after you break the seal? For commercially prepared mayonnaise, about two months in the refrigerator provides a useful general guideline.

Federal food-storage guidance lists commercial mayonnaise at approximately two months after opening when refrigerated properly.

However, that guideline assumes good handling.

The jar should remain refrigerated.

You should use clean utensils.

The lid should close securely.

In addition, the mayonnaise should not spend long stretches at room temperature.

If you repeatedly leave the jar beside the grill, sandwich station, or picnic table, the storage window becomes less reassuring.

Therefore, the best answer to How Long Does Mayonnaise Last in the Fridge includes both time and handling.

Commercial mayonnaise gets an important safety advantage from its manufacturing process. Many commercially made mayonnaise products use pasteurized eggs or egg products. Federal guidance specifically notes that commercially prepared mayonnaise and similar sauces commonly contain pasteurized eggs.

Still, pasteurization does not make an opened jar permanent.

Each time you open the container, you expose it to the kitchen environment.

A dirty knife can introduce food particles.

A spoon that touched tuna, chicken, or another ingredient can introduce additional microorganisms.

Likewise, crumbs or moisture inside the jar can affect quality.

For that reason, never dip a used sandwich knife back into the mayonnaise jar.

Instead, use a clean spoon whenever possible.

Then close the lid promptly and return the jar to the refrigerator.

If you use mayonnaise only occasionally, write the opening date on the lid with a washable marker or piece of tape.

That simple step removes much of the guesswork.

As a result, How Long Does Mayonnaise Last in the Fridge becomes an easy question rather than a refrigerator mystery.

Homemade Mayonnaise Has a Much Shorter Storage Life

Homemade mayonnaise requires more caution.

Unlike commercial mayonnaise, homemade versions may contain raw shell eggs that receive no commercial pasteurization or final heat treatment.

Because raw eggs can carry Salmonella, federal guidance does not recommend using ordinary raw shell eggs in homemade mayonnaise. Instead, it recommends pasteurized shell eggs or pasteurized egg products.

Even when you use pasteurized eggs, homemade mayonnaise does not last nearly as long as a commercial jar.

Federal guidance recommends keeping homemade mayonnaise refrigerated and using it within four days.

Therefore, when you ask How Long Does Mayonnaise Last in the Fridge, you must first identify which kind you have.

Commercial mayonnaise: about two months after opening when properly refrigerated.

Homemade mayonnaise with pasteurized eggs: use within four days.

That difference is significant.

If you make mayonnaise at home, prepare only as much as you expect to use within several days.

Store it in a clean, covered container.

Likewise, label the container with the preparation date.

Do not rely only on smell to decide whether an older homemade batch remains safe.

Foodborne bacteria may not create an obvious odor or visible change.

Therefore, storage time matters.

Also, do not assume that adding lemon juice or vinegar makes homemade mayonnaise automatically safe for extended storage.

Acidity affects the product, but home preparation does not create the same controlled manufacturing environment as commercial production.

If your recipe calls for raw egg, use pasteurized eggs.

Then refrigerate the finished mayonnaise immediately.

In addition, do not freeze mayonnaise as a storage solution. Freezing can break the emulsion and leave the mayonnaise separated or curdled after thawing. Federal guidance specifically notes that homemade mayonnaise does not freeze well.

How to Tell When Mayonnaise Has Gone Bad

Check the Color, Smell, Texture, and Container

How Long Does Mayonnaise Last in the Fridge is only part of the decision.

You should also examine the mayonnaise before using it, especially when the jar has been open for several weeks.

Start with the color.

Fresh mayonnaise usually looks creamy white, ivory, or slightly yellow depending on the recipe.

If the mayonnaise develops an unusual gray, brown, dark yellow, or otherwise unexpected color, discard it.

Next, smell it.

Fresh mayonnaise has a mild, tangy aroma.

However, if it smells strongly rancid, fermented, rotten, or unpleasant, do not taste it.

Throw it away.

Then look at the texture.

A small amount of separation may occur in some products, particularly near the surface. However, dramatic separation, excessive liquid, curdling, bubbling, or an unusual grainy texture can indicate that the product has deteriorated.

Also inspect the jar itself.

A bulging lid, broken seal, leaking container, or damaged packaging deserves caution.

Likewise, mold around the rim or inside the lid means you should discard the entire jar.

Do not simply scrape away visible mold and continue using the mayonnaise.

How Long Does Mayonnaise Last in the Fridge becomes much less important once obvious spoilage appears.

A jar that looks or smells wrong should go into the trash even if you opened it recently.

At the same time, a normal appearance does not guarantee safety when you know the product sat out too long or suffered improper handling.

Therefore, use your senses as one part of the decision rather than the only test.

Think about the storage history.

Consider the opening date.

Check the refrigerator temperature.

Then examine the mayonnaise itself.

When several warning signs point in the same direction, discard the jar.

Do Not Taste Questionable Mayonnaise to Test It

One common mistake involves tasting suspicious mayonnaise “just to check.”

Avoid that habit.

If the mayonnaise has an abnormal odor, strange texture, obvious discoloration, mold, or questionable storage history, tasting it provides no useful safety advantage.

Instead, discard it.

Foodborne pathogens do not always produce flavors that you can detect.

Therefore, a normal taste does not prove that the product is safe.

Likewise, a tiny taste can still expose you to contaminated food.

How Long Does Mayonnaise Last in the Fridge should encourage a preventive approach rather than a taste test.

Use time, temperature, handling, and visible signs together.

For example, imagine that you opened a commercial jar six weeks ago.

You kept it consistently refrigerated.

You always used clean utensils.

The lid remained tight.

The mayonnaise looks and smells normal.

In that situation, the product still falls within the common two-month refrigerated guideline.

Now imagine a second jar.

You opened it only two weeks ago, but it sat on a warm picnic table for most of an afternoon.

In that case, the shorter calendar time does not automatically make the jar a good choice.

Improper temperature control can matter more than the date.

The same principle applies to dishes made with mayonnaise.

Potato salad, chicken salad, tuna salad, coleslaw, and deviled eggs contain other perishable ingredients.

Therefore, their storage limits do not become the same as the mayonnaise jar itself.

Once you mix mayonnaise with cooked potatoes, chicken, eggs, seafood, or chopped vegetables, follow the storage guidance for the finished dish rather than assuming the two-month mayonnaise rule applies.

That distinction prevents a common misunderstanding.

A jar of mayonnaise can remain refrigerated for weeks.

A bowl of chicken salad cannot.

Consequently, How Long Does Mayonnaise Last in the Fridge refers specifically to the mayonnaise product unless you are discussing a prepared dish.

How Temperature and Handling Affect Mayonnaise Storage

Keep Opened Mayonnaise Consistently Refrigerated

Refrigeration plays a central role in How Long Does Mayonnaise Last in the Fridge.

Once you open commercial mayonnaise, keep it refrigerated according to the package instructions.

Consistent cold storage slows microbial growth and helps preserve texture and flavor.

Your refrigerator should stay at 40°F or below for perishable foods. Federal food-safety guidance uses 40°F as the standard refrigerator temperature.

Where you place the jar can also help.

Keep mayonnaise on an interior shelf rather than in a spot that receives frequent temperature changes.

Many refrigerator doors experience slightly more fluctuation because warm air enters every time someone opens the refrigerator.

For a frequently used condiment, door storage may still be convenient. However, an interior shelf provides more consistent temperature control.

In addition, return the mayonnaise to the refrigerator promptly after use.

Do not leave it sitting out simply because you plan to make another sandwich later.

The same approach applies during parties and cookouts.

Take out only the amount you expect to use.

You can place a smaller serving portion on the table while leaving the main container refrigerated.

That method reduces repeated warming of the entire jar.

How Long Does Mayonnaise Last in the Fridge also depends on what happens before refrigeration resumes.

Warm temperatures accelerate deterioration in many perishable foods.

Therefore, a jar that repeatedly cycles between cold and warm conditions may lose quality faster than one that stays cold.

Clean handling matters just as much.

Always use a clean utensil.

Do not lick a knife and return it to the jar.

Do not dip a spoon from chicken salad back into the mayonnaise.

Likewise, avoid introducing crumbs, meat juices, or other food residues into the container.

These habits sound small.

However, they help preserve the product and reduce unnecessary contamination.

Printed Dates Are Useful, but They Do Not Tell the Whole Story

People often answer How Long Does Mayonnaise Last in the Fridge by looking only at the printed date.

However, package dates need context.

A best-by date often focuses primarily on product quality rather than acting as an automatic safety deadline.

Therefore, an unopened jar does not necessarily become spoiled the moment the printed date passes.

At the same time, you should not ignore the date completely.

Use it alongside the condition of the package and the manufacturer’s storage directions.

For an opened jar, the opening date becomes especially important.

A mayonnaise container may still display a distant best-by date even though you opened it months earlier.

That is why writing the opening date on the lid can help.

Suppose the package date sits six months in the future, but you opened the jar ten weeks ago.

The printed date alone does not account for the time since opening.

By contrast, an unopened jar may still fall within its expected quality period when stored properly.

Therefore, How Long Does Mayonnaise Last in the Fridge involves two different timelines:

One timeline begins with manufacturing and appears on the package.

The second begins when you open the jar.

For everyday home storage, that second timeline deserves close attention.

Also follow any specific manufacturer instructions.

Different formulations can vary.

Reduced-fat mayonnaise, specialty emulsions, flavored mayonnaise, and products with different ingredients may have their own storage recommendations.

If the label says “use within X days after opening,” follow that instruction rather than applying a generic rule.

Likewise, if a container says “refrigerate after opening,” treat that instruction seriously.

Good food safety combines general guidance with product-specific information.

Best Practices for Storing Mayonnaise and Mayonnaise-Based Foods

Use Clean Utensils and Label the Opening Date

If you frequently wonder How Long Does Mayonnaise Last in the Fridge, a few simple habits can make the answer much clearer.

First, write the opening date on the lid.

Use a small piece of tape or removable label.

For example:

“Opened September 2.”

Now you can quickly calculate how long the mayonnaise has been refrigerated.

Second, use only clean utensils.

A clean spoon keeps tuna, chicken, breadcrumbs, or other food debris out of the jar.

Third, close the lid firmly after each use.

This prevents spills and reduces unnecessary exposure.

Fourth, keep the jar consistently cold.

Do not leave the main container sitting out during long meals.

Instead, spoon a small amount into a separate serving dish when necessary.

Fifth, avoid combining old and new mayonnaise in the same container.

Adding fresh mayonnaise to an older jar makes the storage history harder to track.

Finally, clean the rim when needed.

Dried mayonnaise around the threads can make the lid difficult to close tightly.

A clean rim creates a better seal and makes it easier to notice unusual mold or discoloration.

These small steps can extend quality while making food-safety decisions easier.

How Long Does Mayonnaise Last in the Fridge should not require guessing.

Good labeling gives you a clear date.

Good handling gives you greater confidence in that date.

For homemade mayonnaise, labeling becomes even more important because the storage period is much shorter.

Write the preparation date on the container.

Then use the mayonnaise within four days when made safely with pasteurized eggs or egg products.

If you cannot remember when you made it, discard it.

A tablespoon of mayonnaise costs far less than a foodborne illness.

Mayonnaise-Based Salads Have Their Own Shorter Storage Limits

One of the most important distinctions in How Long Does Mayonnaise Last in the Fridge involves prepared foods.

The two-month guideline for opened commercial mayonnaise does not mean a tuna salad or potato salad lasts two months.

Once you combine mayonnaise with other ingredients, the finished dish takes on its own storage life.

Chicken salad contains cooked poultry.

Tuna salad contains fish.

Egg salad contains cooked eggs.

Potato salad often contains cooked potatoes, eggs, onions, and other ingredients.

Each combination creates a perishable prepared food.

Therefore, store these dishes promptly and use them within the recommended period for leftovers rather than relying on the mayonnaise jar’s storage life.

Similarly, do not leave mayonnaise-based salads sitting at room temperature for long periods.

The mayonnaise itself is not necessarily the only concern.

Other ingredients can support microbial growth when they remain warm.

This distinction becomes especially important during cookouts, parties, and buffets.

People often blame mayonnaise whenever potato salad becomes a food-safety concern.

However, the entire dish matters.

Therefore, keep cold dishes cold.

Serve smaller portions and replenish them from the refrigerator instead of placing one large bowl outside for hours.

Likewise, discard food that has remained at unsafe temperatures too long.

How Long Does Mayonnaise Last in the Fridge provides useful guidance for the condiment itself.

However, once mayonnaise becomes part of another recipe, follow the storage requirements for that complete dish.

This approach makes food safety more accurate and prevents the false assumption that a stable condiment can preserve every ingredient mixed into it.

Frequently Asked Questions

How Long Does Mayonnaise Last in the Fridge after opening?

Opened commercial mayonnaise can generally be refrigerated for about two months when stored consistently cold and handled with clean utensils.

How long does homemade mayonnaise last in the fridge?

Homemade mayonnaise made safely with pasteurized eggs or pasteurized egg products should stay refrigerated and be used within four days.

Can I eat mayonnaise after the best-by date?

A best-by date often relates to quality rather than automatically meaning the mayonnaise becomes unsafe the next day. However, you should consider whether the jar has been opened, how long it has been refrigerated, how it was handled, and whether the product shows spoilage.

What are the main signs that mayonnaise has gone bad?

Discard mayonnaise if you notice mold, a strongly rancid or rotten odor, major discoloration, unusual bubbling, dramatic separation, or a damaged container. Also discard it when the storage history makes you uncertain about safety.

Can I make homemade mayonnaise with raw eggs?

A safer method uses pasteurized shell eggs or pasteurized egg products. Federal guidance recommends pasteurized eggs for mayonnaise and other recipes that contain eggs without thorough cooking.

Conclusion

How Long Does Mayonnaise Last in the Fridge depends first on whether you have commercial or homemade mayonnaise.

For opened commercial mayonnaise, about two months of refrigerated storage provides a practical guideline when the product remains properly chilled and cleanly handled.

Homemade mayonnaise requires a much shorter timeline.

When you prepare homemade mayonnaise with pasteurized eggs or egg products, keep it refrigerated and use it within four days.

However, time does not tell the entire story.

Storage conditions matter.

So does handling.

A jar that repeatedly sits at warm temperatures or receives contaminated utensils may deteriorate sooner.

Therefore, keep mayonnaise cold, close the lid promptly, and use clean utensils every time.

Also check the product before serving it.

Unusual discoloration, an unpleasant rancid odor, mold, dramatic separation, or suspicious packaging all provide reasons to discard it.

Most importantly, never taste questionable mayonnaise simply to test whether it is still good.

If the jar’s storage history is unclear, throwing it away provides the safer choice.

How Long Does Mayonnaise Last in the Fridge becomes much easier to manage when you label the opening date.

Write it directly on the lid or on a small piece of tape.

Then you can quickly tell whether the jar remains within the usual storage window.

Finally, remember that mayonnaise-based salads follow different rules.

A jar of mayonnaise may keep for weeks, but chicken salad, tuna salad, egg salad, and potato salad contain additional perishable ingredients and need much shorter refrigerated storage.

With careful refrigeration, clean utensils, clear labeling, and common-sense inspection, you can use mayonnaise confidently without keeping questionable jars around longer than necessary.