How Long Does Mayonnaise (Opened) Last?
Opened commercial mayonnaise.
The Short Answer
Mayonnaise (Opened) lasts 60–90 days in the refrigerator when stored properly at 40°F or below. These times are based on USDA food safety guidelines and assume proper storage conditions.
Storage Times at a Glance
Source: USDA FoodKeeper | Last verified: March 19, 2026 | Our methodology
Commercial mayo is more stable than you think. The vinegar and lemon juice in the recipe are preservatives. It lasts 2-3 months opened in the fridge. Homemade mayo, on the other hand, lasts only 5-7 days.
How to Store Mayonnaise (Opened)
Keep the lid tightly closed. Always use a clean utensil. Store in the fridge, not the door.
How to Tell if Mayonnaise (Opened) Has Gone Bad
Look for these signs that mayonnaise (opened) has spoiled: separated oil on top, off or sour smell, yellow discoloration, mold.
The Professor's rule: When in doubt, throw it out. No meal is worth food poisoning.
The Bottom Line
Properly stored mayonnaise (opened) stays safe for 60–90 days in the fridge. Always store in airtight containers, refrigerate within 2 hours of purchase or preparation, and trust your senses. If something looks, smells, or feels off, discard it regardless of how many days it has been.
Frequently Asked Questions
Commercial mayo can sit at room temperature for up to 8 hours safely due to its acidic pH. However, always return it to the fridge promptly. Homemade mayo should never be left out.