How to Store Mayonnaise in Refrigerator

How to Store Mayonnaise in Refrigerator

Mayonnaise is one condiment that absolutely requires proper refrigeration. Made with eggs and oil, it's highly perishable once opened and can become a food safety risk if stored incorrectly. Here's everything you need to know.

Does Mayonnaise Need to Be Refrigerated?

Yes — always refrigerate mayonnaise after opening. Commercial mayonnaise contains preservatives (vinegar, lemon juice, salt) that make it shelf-stable before opening, but once the seal is broken, it must be kept cold to prevent bacterial growth, particularly Salmonella from the egg content.

Unopened mayonnaise can be stored in a cool, dark pantry until the best-by date. Once opened, it goes straight to the fridge.

How Long Does Mayonnaise Last in the Refrigerator?

• Opened commercial mayonnaise (refrigerated): Up to 2 months after opening
• Homemade mayonnaise (refrigerated): 3–5 days only
• Mayonnaise left at room temperature: Discard after 2 hours (or 1 hour if above 90°F / 32°C)

Step-by-Step: How to Store Mayonnaise in the Refrigerator

1. Refrigerate Immediately After Opening

As soon as you open a jar of mayonnaise, place it in the refrigerator. Never leave it at room temperature for extended periods, even between uses during meal prep.

2. Keep in the Original Jar

Mayonnaise jars are designed to be airtight and are perfectly suitable for refrigerator storage. Keep it in the original jar with the lid tightly closed.

3. Store on the Middle Shelf — Not the Door

Unlike many condiments, mayonnaise is best stored on the middle shelf of the refrigerator rather than the door. The door is the warmest part of the fridge and experiences temperature fluctuations every time it's opened. Mayonnaise needs consistent cold temperatures to stay safe.

4. Use a Clean Utensil Every Time

Always use a clean spoon or knife to scoop mayonnaise. Introducing food particles or bacteria from other foods can contaminate the jar and shorten its shelf life significantly.

5. Never Return Used Mayonnaise to the Jar

If you've mixed mayonnaise with other ingredients (for a sandwich spread or dip), never return the unused portion to the original jar. Discard any mixed mayonnaise that has been sitting out.

Mayonnaise in Dishes and Salads

When mayonnaise is used in dishes like potato salad, coleslaw, or egg salad:

• Keep the dish refrigerated at all times.
• Do not leave out for more than 2 hours at room temperature.
• Store in an airtight container and consume within 3–5 days.

For storing mayo-based salads and dishes, the C CREST 10 Pack Glass Meal Prep Containers are airtight and keep contents fresh without absorbing odors.

Signs Mayonnaise Has Gone Bad

• Sour or off smell
• Yellow or brown discoloration (fresh mayo is white or pale yellow)
• Watery separation that doesn't mix back in
• Mold (discard immediately)
• Off or rancid taste

Quick Summary: Mayonnaise Storage

• Always refrigerate after opening — no exceptions.
• Store on the middle shelf, not the door.
• Use within 2 months of opening.
• Always use a clean utensil.
• Discard if left at room temperature for more than 2 hours.
• Homemade mayo lasts only 3–5 days in the fridge.