Everyone to know the tell-tale indications that summer is finally taking off. Between the barbecues, picnics, coast trips, and camping plans, each year the warmer weather brings fun outdoor tasks filled with an excellent food. 

And with the great food always come particular warnings: drink many of water, save your ice in a high-quality cooler, and also don’t leave your mayonnaise the end in the sun. 

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

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So the concern remains: how long does mayo last unrefrigerated?

It’s always a great idea to recognize what the mayo shelf life is, yet how lengthy is it safe to save it out of the fridge – whether it’s in her potato salad or sit in the cooler? 

Contents show
The legend
part Background
The Truth
So exactly how Long Does mei Last Unrefrigerated?

The Myth

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

The id is that when you let mayo sit outside, unrefrigerated and also unprotected, it becomes an ext and more susceptible come bacteria.

Some Background

The legend of mei stems native the fact that mayonnaise consists of egg. The FDA offers strong recommendations for food safety once it pertains to eggs and also foods include eggs.

Since this chicken by-product have the right to contain Salmonella, they advise people to not just keep egg refrigerated, but to ensure that they are fully cooked before eating. 

Salmonella is a team of bacteria that is usual in resulting in food poisoning, which can result in fever, ab pain, diarrhea, and vomiting. In part rare extreme cases, it deserve to even cause death. 

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Likewise, the FDA likewise provides strictly serving guides once it concerns eggs and also egg dishes. These professionals say it is ideal to serve any type of foods made with eggs automatically after serving.

If you intended to offer them later on, climate they should be refrigerated till then.

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

To take things a action further, the FDA says that cook eggs have to never be left out of the refrigerator for an ext than two hours – and also just one hour in very hot temperatures.

The reason behind this is the bacteria will grow an ext quickly in warm temperatures, enhancing the threat of food poisoning. 

When we take every one of that information into consideration, it makes sense why people would jump to the conclusion the mayonnaise, which includes eggs, would autumn under this same category and also rules.

The Truth

The reality of the matter is that your potato salad containing mayonnaise will be simply fine come leave out at her next family members picnic, and there’s a very, an extremely slim opportunity that the will harm anyone at all.

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

Generic, typical, store-bought mayo is typically made with some sort of mountain – most commonly, vinegar or lemon juice.

Because the product is acidified, it actually kills any food-borne pathogens it comes into call with. 

So not only will there no be any Salmonella in your mayo, however your mayo will prevent any kind of other bacteria from forming.

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

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

So how Long Does mei Last Unrefrigerated?

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

Because it has actually been pasteurized, it has a decently long shelf life while the container is quiet sealed.

You’re for sure to keep it unopened and also sealed in your pantry for about three or 4 months after its “best used by” date.

If because that some reason you’re looking to save mayo for longer, you have the right to refrigerate it unopened and sealed for up to a year.

Even though mayonnaise has acids the will assist kill turn off bacteria, it still should be refrigerated after ~ opening.

So long as you carry out this, it’ll save for a good two or three months.

However, unrefrigerated, your open jar that mayonnaise will more than likely be bad after about eight hours.

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

Some easy indicators to tell if her mayo has actually gone negative is signs of mold or spore growth, or a awful smell. Her mayonnaise may likewise be a pair shades darker than usual, too. 


There might be foodstuffs at the barbecue that have the right to potentially residence harmful bacteria, yet your mayonnaise is no to it is in blamed for any kind of food-borne illnesses.

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With the lot of acid added to this product, not only is it for sure to keep outside, yet it has a lengthy shelf life, too. 

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You can definitely leave commodities with mayo exterior at an occasion for a couple of hours, however it’s also a an excellent idea to store a cooler comfortable for specifically long, hot days.

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

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