How Long Can Mayo Sit Out? | CoookingBeFun (2023)

If you’ve bought store-bought Mayo, the answer is three weeks or two months. Homemade Mayo can last up to a month or more without refrigeration.

Disclaimer: This post may contain affiliate links, so we’ll earn a commission when you purchase through any of the links in this article. Please note that you’ll not incur additional costs when you buy through our links. You can read our full disclaimerhere.

How Long Can Mayo Sit Out?

Generally speaking, mayonnaise can sit out at room temperature for two hours before spoiling, though meat and vegetables will go rancid after about two hours. If you’re concerned about food spoilage, refrigerate leftovers immediately. As long as they don’t get too cold, they’ll stay fresh for another day or two. It’s best to refrigerate Mayo as soon as possible, but you don’t want to leave it out overnight.

Store-bought mayonnaise has a longer shelf life than homemade Mayo. It won’t go bad for an hour or two when left out at room temperature. But a homemade version will spoil after two hours. So, if you’re worried about rancidity, make sure you refrigerate the mayonnaise right away. You can refrigerate leftovers for two to four days or up to five weeks.

(Video) Which Mayo Do Southerners Prefer?

Can Mayonnaise Go Bad?

When does mayonnaise go bad? Most often, it turns yellowish-brown or has a putrid odor. The first clues that your mayonnaise has gone bad are a sour vinegar-like smell, a color change, and a different flavor. It is not good to eat old mayonnaise, even if it looks okay. In addition, you should not use it for sandwiches or salads.

Whether you’re using homemade mayonnaise or a commercial brand, you can always determine the expiration date by checking the packaging. Remember that homemade mayonnaise may go bad faster than commercial products since it contains raw eggs.

While you can store commercial varieties for up to two months after opening, you should avoid storing homemade varieties. If you’re unsure how long your mayonnaise will last, check the label on the container to ensure that it is not expired. If the can is open, place it in the refrigerator or a cool place, as it will last longer. If you’ve accidentally purchased spoiled mayonnaise, dispose of it immediately.

Is Mayonnaise Safe To Eat If Left Out Overnight?

No, Mayonnaise isn’t safe to eat overnight. It can only stay fresh for eight hours. It’s important to refrigerate mayonnaise after leaving overnight.

If you leave it out longer than eight hours, you should throw it away, and if you accidentally left it out, you should refrigerate it immediately. If you eat it the next day, you should use it up as quickly as possible.

The NPD Group, a global information company, has published a study showing that commercially produced mayonnaise does not need to be refrigerated, though homemade mayonnaise should still be refrigerated. The sauce’s acidity inhibits the growth of bacteria, so the NPD Group recommends discarding the jar if it has not been opened and used within two hours.

(Video) HOW TO MAKE MAYONNAISE | easy mayo recipe with stick blender

As soon as you notice any signs of spoilage, you can make an educated judgment call. Although it is common knowledge that mayonnaise can go bad if left out for a long time, this is rarely true. The FDA allows for an eight-hour window of exposure for Mayo. If it is left out longer, it can develop harmful bacteria. You should, therefore, use the jar as soon as possible and refrigerate it immediately.

How Do You Know If Mayonnaise Is Spoiled?

When determining whether or not mayonnaise has gone bad, there are several signs that it’s spoiled. If the consistency is too thick, it’s probably spoiled. The color will also be brownish or off-white, and the consistency will be sour. A darkened or yellowish color is also a sign of spoilage. You can fix it by stirring and adding more lemon juice or water.

A typical sign that mayonnaise has gone bad is its discoloration. When the color is darker than its original shade, it has gone rancid or isn’t fresh, and the consistency will change. In other words, fresh Mayo should be creamy, have a mild smell, and must never have discoloration or an acidic odor. Therefore, you’ll need to throw away any jar of Mayo with these three signs.

Look for the best-by or use-by date on the jar. You can safely consume the jar after this date, but you should throw it out as soon as it looks or smells off. Ensure the jar is well-refrigerated and isn’t more than half a year old. The best way to determine if your mayonnaise has gone bad is to smell it. A sour, vinegar-like smell is a sign that the mayonnaise is rotten.

How to Keep Mayonnaise Fresh for Longer

Using the correct storage container is essential to preserve your Mayo for longer. The best storage solution is in the refrigerator, as it’s colder than room temperature, so the Mayo can expand and stay fresher for longer. To make your mayonnaise last for months, freeze it. Just make sure to leave an inch of space at the top of the jar.

Depending on the quality and seasoning, it can last up to two months on the shelf. If you don’t plan on using it immediately, you can keep it in the refrigerator for three to four months. When storing it in the fridge, checking the “best by” date is essential. The best-by date is the date the jars were packaged.

(Video) BEFORE You Make MAYO, THIS is the #1 Ingredient to keep it for 3 Months Fresh in the Fridge!

Store-bought mayonnaise can last for up to two months after its expiration date. Homemade mayonnaise will start to turn bad, and the odor and color of green mold will become noticeable. You might want to buy a jar of Mayo for a month or two and enjoy it immediately.

Can You Leave Mayo Out After Opening?

The shelf life of mayonnaise varies. Store-bought Mayo keeps well for three months after opening, while homemade Mayo stays fresh for only a few days. Yes, you can leave Mayo out after opening, but not longer than eight hours. It’s difficult to tell when it’s gone bad, as you can’t smell it or taste it to tell if it’s bad. However, it’s better to use it up soon, as the shelf life of unopened jars is only three to four months.

The shelf-life of mayonnaise depends on the type of mayonnaise. Commercial varieties are shelf-stable before being opened, like Hellman’s Real Mayonnaise and Sir Kensignton. However, you must use homemade versions right away. It’s safe to leave an open jar of mayonnaise out on the counter at room temperature for up to eight hours. However, if you’re concerned about the product’s safety, simply throw it out if it gets too warm.

How Long Can Mayo Sit Out? | CoookingBeFun (1)
How Long Can Mayo Sit Out? | CoookingBeFun (2)

Unless you’re making your mayonnaise, you should refrigerate it after opening. Refrigerated mayonnaise can last for up to a year, but it’s best to eat it right away. It will last up to two or three months in a refrigerator. You should eat unrefrigerated mayonnaise within eight hours of opening.

Can You Keep Mayo In The Cupboard?

Yes, you can keep unopened jars of mayonnaise in the cupboard. They don’t need refrigeration. You can store them for three to four months after their best-before dates. To extend the shelf-life of your mayonnaise, you can use pesto, which is made from basil, pine nuts, cheese, olive oil, and garlic. Then, you can add it to your sandwiches.

(Video) How To Use Mayonnaise For Hair Growth

It is important to note that the best-before date of your mayonnaise may differ from other brands. In general, you can’t reliably extend the shelf-life of mayonnaise if you keep it in a refrigerator. In addition, a refrigerator isn’t necessary for Mayo. It has a long shelf-life, but it’s still a good idea to keep it out of the reach of children.


1. Brown Butter Mayo
(Allergies Bite but Taste Good)
2. Adding this one ingredient to homemade mayo changed it all! | EASIEST DIY MAYO
(Homesteading Family)
3. Mayo Clinic Minute: 5 tips for constipation alleviation without medication
(Mayo Clinic)
4. This is what I eat instead of mayonnaise.
(How To Cook Smarter)
5. How to Fix a Broken Mayonnaise 😉
6. Mayo Clinic Minute: What to do when sick with a norovirus (or stomach flu)
(Mayo Clinic)


Top Articles
Latest Posts
Article information

Author: Greg O'Connell

Last Updated: 30/09/2023

Views: 5946

Rating: 4.1 / 5 (62 voted)

Reviews: 93% of readers found this page helpful

Author information

Name: Greg O'Connell

Birthday: 1992-01-10

Address: Suite 517 2436 Jefferey Pass, Shanitaside, UT 27519

Phone: +2614651609714

Job: Education Developer

Hobby: Cooking, Gambling, Pottery, Shooting, Baseball, Singing, Snowboarding

Introduction: My name is Greg O'Connell, I am a delightful, colorful, talented, kind, lively, modern, tender person who loves writing and wants to share my knowledge and understanding with you.