How long does Mayonnaise last?
How long does Mayonnaise last? fridge 2 months. Plus spoilage signs, sources, and an unopened-vs-opened note.
Quick answer
Sealed / unopened: Varies
Signs Mayonnaise has gone bad
- Sharp acidic or sour smell, yellow-brown discoloration, watery separation.
- Any mold growth.
Discard immediately if
- Rancid smell
- Was left unrefrigerated more than 2 hours (mayo, dressings)
- Visible mold or yeasty bubbles
Why guidance varies
Vinegar, salt, sugar, and acidity content vary widely by brand and formulation — natural and reduced-sugar versions spoil 2–3× faster than traditional ones.
Get a heads-up before it expires. Search the full database instead.
Frequently asked questions
How long does Mayonnaise last?
In the fridge: 2 months. Sealed / unopened: Varies. Always refrigerate after opening. Never leave out for more than 2 hours. Never freeze.
How can you tell if Mayonnaise has gone bad?
Signs that Mayonnaise has gone bad: Sharp acidic or sour smell, yellow-brown discoloration, watery separation; Any mold growth.
What does the date label on Mayonnaise mean?
Mayonnaise usually carries a "Best By" date. A quality marker — the product is at peak quality before this date, but it’s safe to eat afterward if stored correctly. See our date-labels guide for the full breakdown.
Sources for this answer
- A USDA FoodKeeper — Storage windows and refrigeration guidance for this category.
- A FDA — Are You Storing Food Safely? — Date-label interpretation and food-safety baseline.