Mayonnaise
The answer
Opened mayonnaise lasts about 2 months in the fridge. Do not freeze it.
Caution Refrigerate after opening. Commercial mayo is acidified — the bigger risk is the foods it’s mixed into, not the jar itself.
How long it keeps
Fridge (40°F) ~2 months safe window
Freezer (0°F) Do not freeze best quality
Room temp 2 hours max then discard
Discard Discard if it smells sour, separates with an oily layer, or shows any mold.
The answer
Unopened mayonnaise keeps 3–4 months past its printed date in the pantry.
How long it keeps
Fridge (40°F) Not needed safe window
Freezer (0°F) Do not freeze best quality
Pantry 3–4 months past date OK stored right
Discard Discard bulging or leaking jars.
By state & packaging
State Fridge Freezer
Opened, refrigerated ~2 months Do not freeze
Unopened, pantry — —
Mayo-based salads (egg, tuna, chicken) 3–4 days Does not freeze well
Signs it has gone bad
✕ Sour or acidic smell
✕ Oily separation or yellowing
✕ Mold anywhere in the jar
FAQ
How long can mayonnaise sit out?
No more than 2 hours once opened. Discard mayo — or anything made with it — left out longer.