How Long Does Mayonnaise Last After Opening?

What to know to keep your mayo fresh longer.

mayonnaise spread on a slice of bread
Credit:

Caitlin Bensel; Food Stylist: Torie Cox

Key Points

  • Store-bought mayo lasts 2 to 3 months in the fridge after opening, but homemade versions should be used within 3 to 5 days.
  • Keep mayo in the coldest part of the fridge, tightly sealed, and use clean utensils to prevent spoilage.
  • Toss it if you see mold, discoloration, strange texture, or smell.

Mayonnaise—need we say more? This creamy staple is a key ingredient in Southern kitchens, starring in everything from potato salad and deviled eggs to pineapple sandwiches. But mayonnaise can be tricky when it comes to shelf life. If you've ever found a near-empty jar in the back of your fridge and wondered if it was still safe to use, here's how to tell if it needs to be discarded, along with tips to keep your jar of mayo fresh for longer.

Shelf Life of Opened Mayonnaise

The good news is that opened mayonnaise can last quite a while. Store-bought mayo, with preservatives to extend its shelf life, can last for two to three months in the refrigerator after opening. Always check the label for any specific guidance—certain brands and types may last longer than others.

On the other hand, homemade mayonnaise spoils much more quickly, and should be used within three to five days for the freshest flavor and texture. Keep refrigerated when not using.

Differences Between the Best-By and Use-By Date

You've probably noticed a few different dates printed on food packaging, and you might have wondered what they really mean. Understanding the difference between sell-by, best-by, and use-by dates can help you determine when it's best to enjoy your mayonnaise by:

  • Sell-by date: Indicates how long a product should remain on the shelf in the supermarket.
  • Best-by date: When a product is at it's best flavor and quality.
  • Use-by date: The last date recommended for use while at peak quality. After this date, the flavor or texture may decline.

While these dates are important to keep in mind, mayonnaise that hasn't been opened or isn't showing any signs of spoilage can be enjoyed past these dates.

Tips When Storing Mayonnaise

When storing an opened jar of mayonnaise, keep these tips in mind to keep it as fresh as possible:

  • Avoid the door: While it might be convenient to store mayonnaise in the refrigerator door for quick grabbing when you need it, it's best to store it in the main area of the fridge, where temperatures are more stable. The door is more prone to temperature fluctuations every time the fridge is opened, which can speed up spoilage.
  • Tightly sealed: Always keep the jar tightly sealed to minimize air exposure.
  • Clean utensils: Use clean utensils when portioning the mayonnaise to avoid introducing bacteria into the mix.
  • Avoid freezing: While freezing mayonnaise is possible, it can break its emulsion after thawing, leading to a separated or grainy texture.
tomato sandwiches with mayonnaise
Credit:

Caitlin Bensel; Food Stylist: Torie Cox

Signs of Mayonnaise Spoilage

If you notice any of these signs of spoilage, it's safest to discard your mayo to avoid the risk of foodborne illness:

  • Color change: Any darkening or yellowing can indicate the mayonnaise isn't fresh.
  • Separation: While some separation can happen, discard if you notice a watery or curdled texture.
  • Off-smell: A sour, acidic, or off-smell is a sign you should throw it away.
  • Mold: Any signs of mold mean the mayonnaise is no longer safe to eat.

Creative Ways To Use Up Mayonnaise

While you could just slather it on some bread and make sandwiches, here are some other creative ways to make good use of this kitchen staple, particularly if you want to use it up in a hurry:

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