Everyone knows the tell-tale indications that summer is lastly taking off. Between the barbecues, picnics, coast trips, and camping plans, every year the warmer weather brings funny outdoor tasks filled with an excellent food. 

And v the great food constantly come certain warnings: drink many of water, save your ice cream in a high-quality cooler, and don’t leave your mayonnaise the end in the sun. 

That last instruction (which usually comes from an overly-concerned mother) always tends to cause a little bit of controversy.

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So the inquiry remains: exactly how long does mayo last unrefrigerated?

It’s constantly a great idea to know what the mei shelf life is, however how long is it for sure to keep it the end of the refrigerator – whether it’s in her potato salad or sit in the cooler? 

Contents show
The Myth
part Background
The Truth
So just how Long Does mayo Last Unrefrigerated?

The Myth

People frequently assume the mayonnaise is the resource of potential food-borne illnesses.

The id is that once you let mei sit outside, unrefrigerated and unprotected, that becomes an ext and more susceptible come bacteria.

Some Background

The myth of mei stems from the reality that mayonnaise has egg. The FDA offers strong recommendations because that food safety once it concerns eggs and foods containing eggs.

Since this chicken by-product have the right to contain Salmonella, they advise individuals to not only keep eggs refrigerated, yet to ensure the they are completely cooked before eating. 

Salmonella is a group of bacteria that is usual in causing food poisoning, which can an outcome in fever, ab pain, diarrhea, and also vomiting. In some rare extreme cases, it have the right to even cause death. 

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Likewise, the FDA also provides strict serving guides as soon as it involves eggs and also egg dishes. These specialists say it is finest to serve any type of foods made through eggs automatically after serving.

If you intended to offer them later on, then they must be refrigerated until then.

Furthermore, any type of egg food that demands to be served warm should it is in reheated come a temperature the 165 degrees prior to serving. 

To take points a action further, the FDA claims that cook eggs should never it is in left out of the frozen refrigerator for much more than two hrs – and just one hour in really hot temperatures.

The factor behind this is the bacteria will certainly grow much more quickly in warm temperatures, increasing the hazard of food poisoning. 

When we take all of that details into consideration, it makes sense why world would jump to the conclusion the mayonnaise, which consists of eggs, would fall under this same category and rules.

The Truth

The truth of the issue is that your potato salad containing mayonnaise will certainly be simply fine to leave the end at her next family picnic, and also there’s a very, an extremely slim opportunity that the will damage anyone in ~ all.

Although the product does use eggs, the does no follow the very same rules together eggs ~ above their very own do. 

Generic, typical, store-bought mayo is normally made through some type of acid – many commonly, vinegar or lemon juice.

Because the product is acidified, it in reality kills any type of food-borne pathogens it comes into call with. 

So not just will there no be any Salmonella in your mayo, but your mayo will prevent any kind of other bacteria indigenous forming.

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In a way, the mayonnaise is actually protecting you and also your family. The same is true for various other dressings together well.

If someone it s okay sick from eat potato salad outdoors, it’s more likely the the potatoes brought about it and also not the mayo.

So just how Long Does mei Last Unrefrigerated?

You’ve more than likely noticed that mei is not kept in the refrigerator section of the grocery store.

Because it has been pasteurized, it has a decently long shelf life if the container is still sealed.

You’re for sure to keep it unopened and sealed in your pantry for about three or four months after its “best provided by” date.

If because that some reason you’re feather to store mayo because that longer, you deserve to refrigerate it unopened and sealed for up to a year.

Even despite mayonnaise includes acids the will aid kill off bacteria, that still must be refrigerated after opening.

So long as you carry out this, it’ll keep for a an excellent two or 3 months.

However, unrefrigerated, your open up jar of mayonnaise will probably be negative after around eight hours.

If you’ve accidentally left it out on the counter overnight, the safety choice is to toss it. 

Some easy indications to tell if your mayo has actually gone bad is indicators of mold or spore growth, or a horrible smell. Your mayonnaise may likewise be a pair shades darker 보다 usual, too. 


There might be foods at the barbecue that deserve to potentially house harmful bacteria, however your mayonnaise is no to be blamed for any type of food-borne illnesses.

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With the lot of acid added to this product, not only is it safe to save outside, yet it has actually a long shelf life, too. 

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You can definitely leave products with mayo outside at an occasion for a few hours, yet it’s also a great idea to save a cooler comfortable for particularly long, hot days.

Your potato salad will certainly taste far better cool, anyway!

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