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How Long Does Mayo Last After Opening It? Tips for Proper Storage

Mayonnaise is a beloved condiment used in a variety of dishes, but how long does it last once the jar is opened? In this article, we'll explore the shelf life of opened mayo, factors that affect its freshness, and tips for proper storage to maximize its longevity.

By Cookist

Mayonnaise is a versatile and flavorful condiment that adds richness to sandwiches, salads, and dips. Typically, unopened mayonnaise should be stored at room temperature in a cool, dry place, such as the pantry or cabinet. However, like all perishable foods, mayo has a limited shelf life once opened. Understanding how long mayo lasts after opening it is essential for food safety and preventing food waste.

What Is The Shelf Life Of Opened Mayo?


Once opened, mayonnaise typically remains fresh for about two to three months when stored properly in the refrigerator. However, factors such as temperature fluctuations, cross-contamination, and exposure to air can affect its freshness and quality. It's crucial to check the expiration date on the jar and use mayo within a reasonable timeframe to ensure optimal taste and safety.

It's important to note that mayo can spoil if left at room temperature for extended periods, especially in warmer climates or during the summer months. To prolong its shelf life, always seal the jar tightly after each use and avoid using utensils that may introduce bacteria into the jar.

Additionally, be mindful of any changes in color, texture, or odor, as these may indicate spoilage. When in doubt, it's best to discard any mayo that appears questionable to prevent food poisoning.

Factors That Can Affect The Freshness Of Mayo


Several factors can impact the shelf life of opened mayo. Exposure to air and light can lead to oxidation, causing the mayo to develop off-flavors and spoil more quickly. Additionally, contamination from utensils or fingers can introduce bacteria into the jar, hastening spoilage.

Temperature fluctuations, such as leaving mayo out at room temperature or storing it in a warm environment, can also accelerate bacterial growth and reduce shelf life.

It's important to store mayo in the refrigerator at all times, ideally at temperatures below 40°F (4°C), to slow down bacterial growth and preserve freshness. When using mayo, always use clean utensils and avoid double-dipping to prevent cross-contamination. Additionally, tightly seal the jar after each use to minimize exposure to air and light.

5 Tips To Help Keep Your Mayo Fresher For Longer


To maximize the shelf life of opened mayo and maintain its freshness, follow these storage tips:

1. Refrigerate promptly

After opening a jar of mayo, refrigerate it immediately to slow bacterial growth and preserve freshness. Keep the mayo in its original container or transfer it to an airtight container to prevent air exposure.

2. Store in the coolest part of your fridge 

Place the mayo in the coldest part of the refrigerator, such as the back or bottom shelf, where temperatures are most consistent. Avoid storing mayo in the refrigerator door, as it is subject to temperature fluctuations from frequent opening and closing.

3. Use clean utensils

When scooping mayo from the jar, use clean utensils to minimize the risk of contamination. Avoid double-dipping or using fingers to scoop mayo, as this can introduce bacteria into the jar.

4. Check for signs of spoilage

Before using mayo, visually inspect it for any signs of spoilage, such as changes in color, texture, or odor. If the mayo appears discolored, slimy, or has an off smell, discard it immediately.

5. Follow proper hygiene practices

Wash hands thoroughly before handling mayo or any other food items to prevent cross-contamination and food poisoning.


Now that you know the shelf life of opened mayonnaise as well as important ways to store it properly, you can enjoy this delicious condiment safely and confidently. By practising proper hygiene, you can extend the freshness of mayo and enhance the flavor of your favorite dishes without worry.

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