How Long Does Mayo Last?
Mayonnaise's shelf life depends on whether it's opened and how it's stored.
An unopened jar of mayonnaise can last for about three months in the pantry. Several sources confirm this timeframe. [Source 1, Source 4, Source 10]
Opened Mayonnaise
Once opened, mayonnaise should be refrigerated. In the refrigerator, commercially produced mayonnaise typically lasts for two months. [Source 1, Source 4, Source 7, Source 9, Source 10]. Some sources suggest it could last even longer, up to six months, if stored properly and contamination is avoided (e.g., using a clean utensil each time). [Source 2] However, it's crucial to follow the two-month guideline for safety.
Homemade Mayonnaise
Homemade mayonnaise is considerably less stable than commercially produced mayonnaise. It should be refrigerated and used within one week of preparation. [Source 1]
Additional Notes
- The "best by" date on the label is an indication of peak quality, not necessarily the end of its safe consumption period. Unopened mayonnaise can remain safe for at least a week beyond this date when stored at room temperature. [Source 3, Source 5]
- Proper storage is key to extending mayonnaise's shelf life. Always refrigerate opened mayonnaise in a tightly sealed container.
- Pay close attention to the mayonnaise's appearance, smell, and taste. Discard it if it shows any signs of spoilage, such as off-odors or unusual discoloration.
