MayonnaiseShelf Life, Storage, and Spoilage Guide
Pantry
Until 'Best By' date (unopened)
Store unopened commercially prepared mayonnaise in a cool, dark pantry. Once opened, mayonnaise must be refrigerated immediately.
Refrigerator
2 months
Always refrigerate commercially prepared mayonnaise promptly after opening. Keep tightly sealed in its original container.
Freezer
Not RecommendedNot recommended
Freezing mayonnaise is not recommended as it causes the emulsion to break, resulting in an oily, separated product with an undesirable texture.
Signs of Spoilage
- Off-odor (sour, rancid, or unpleasant smell)
- Discoloration (darkening or yellowing)
- Visible mold growth
- Separation of ingredients (oily layer on top, watery consistency)
- Unusual texture (lumpy, excessively watery, or slimy)
Room Temperature Safety
40°F–140°F (4°C–60°C)
Mayonnaise, especially after opening, should be returned to the refrigerator as soon as possible after use to prevent bacterial growth within the danger zone.
Safe Handling
Refrigerate commercially prepared mayonnaise promptly after opening.
Do not leave mayonnaise at room temperature for more than 2 hours (1 hour if the ambient temperature is above 90°F / 32°C).
Always use clean utensils to scoop mayonnaise to prevent cross-contamination.
Discard mayonnaise if it has been left out too long or if any signs of spoilage are present.