MayonnaiseShelf Life, Storage, and Spoilage Guide
Pantry
Until 'Best By' date (unopened)
Store unopened commercial mayonnaise in a cool, dark pantry. Once opened, it must be refrigerated.
Refrigerator
2 months (opened)
Refrigerate immediately after opening. Keep tightly sealed. Do not store in the refrigerator door, where temperatures fluctuate.
Freezer
Not RecommendedNot recommended
Freezing mayonnaise is not recommended as the emulsion will break, resulting in an oily, separated, and unappetizing texture upon thawing.
Signs of Spoilage
- Off-odor (sour, rancid, or unpleasant smell)
- Discoloration (darkening, browning, or unusual color changes)
- Mold growth on the surface or around the rim of the container
- Separation of ingredients (oil and egg/water separating)
- Unusual texture (slimy, watery, or excessively thick)
Room Temperature Safety
The temperature danger zone for food is between 40°F (4°C) and 140°F (60°C). Bacteria multiply rapidly in this range.
Always refrigerate mayonnaise and mayonnaise-based dishes promptly. Discard any mayonnaise that has been left in the danger zone for too long to prevent the growth of harmful bacteria.
Safe Handling
Always refrigerate commercial mayonnaise promptly after opening.
Use clean utensils to scoop mayonnaise to prevent cross-contamination.
Do not leave mayonnaise or mayonnaise-based dishes at room temperature for more than 2 hours (1 hour if the temperature is above 90°F/32°C).
Discard any mayonnaise that has been left in the temperature danger zone for too long.