How do you know if Mayonnaise (opened) has gone bad?

Mayonnaise (opened) has likely gone bad if you notice yellow-brown colour, mould, oil separation; sour, rancid, or tangy-off smell; watery, curdled, or lumpy texture. When in doubt, throw it out.

How long does opened Mayonnaise (opened) last in the fridge?

Opened Mayonnaise (opened) lasts 2–3 months refrigerated.

How Long Does Mayonnaise (Opened) Last?

Mayonnaise (Opened) keeps 2–3 months in the refrigerator after opening, according to cited USDA/FDA storage references.

2 cited USDA/FDA/FSIS sources
Editorial review · Verified June 2026

Only storage locations with source-backed entries are shown; a missing freezer or pantry card means FoodLasts does not have a supported value.
Unopened and after-opening tabs are split because the source data has separate entries.

Based on USDA/FSIS guidance:

Refrigerate opened condiments such as mayonnaise and salad dressings; cold storage slows spoilage after opening.

Source

Discard mayonnaise that has separated, darkened, or smells sour. Never leave mayonnaise-based dishes out for more than two hours.

How to tell if it's gone bad

Look:Yellow-brown colour, mould, oil separation
Smell:Sour, rancid, or tangy-off smell
Texture:Watery, curdled, or lumpy texture

When in doubt, throw it out. If Mayonnaise (Opened) smells, looks, or feels off — discard it. Food poisoning is not worth the risk.

Storage tips

Always refrigerate opened mayonnaise and scoop with a clean utensil — crumbs and double-dipping introduce bacteria that shorten its life.

Is it still good?

Enter when you bought or opened it and where it's stored.

Common questions

How long does opened Mayonnaise (opened) last in the fridge?: Opened Mayonnaise (opened) lasts 2–3 months refrigerated.

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