Prep

How long does mayonnaise last?

FoodKeeper gives mayonnaise 3 to 6 months unopened, as a US guide to quality. Once opened, that's 2 months in the fridge.

These are US figures, for quality. They come from USDA FoodKeeper. The date on a UK pack comes first, and Food Standards Agency rules take priority: never eat food after its use-by date. Best before is about quality.

How to store it

Keep unopened jars in the cupboard. Once opened, keep it in the fridge, as the label says. We don't give a cupboard time for it, and FoodKeeper doesn't either.

USDA says temperatures below 85°F (about 29°C) are best, and to avoid anywhere above or beside the cooker, under the sink, or in a damp garage or cellar. Once it's open, follow the storage instruction on the label.

What to look for

Separated oil, a yellower colour, or a sour smell mean it should go.

Don't use food from a cracked jar, or a jar with a loose or bulging lid. Don't taste it to check.

Worth knowing

USDA's outage chart says to discard opened mayonnaise if it has been above 50°F (10°C) for more than 8 hours.

Similar foods

From preppantry.app. Checked 2 November 2026. Independent tool, not official advice.

How it works

FoodKeeper is USDA's food storage database. Its figures are guides to quality for food stored at cool room temperature, not safety cut-offs, and we show them as USDA gives them. FoodKeeper counts this from the date of purchase. Opened times start when you open the pack.

There's no UK shelf-life dataset, so these figures are from the US. The date on your pack comes first. On a UK pack, use by is about safety and best before is about quality, so never rely on this page to go past a use-by date.

Common questions

How long does mayonnaise last unopened?

3 to 6 months, according to USDA FoodKeeper, as a guide to best quality. FoodKeeper counts this from the date of purchase.

How long does mayonnaise keep once opened?

FoodKeeper gives no figure for an opened pack in the cupboard. 2 months in the fridge.

Can I eat mayonnaise after the best before date?

Best before is about quality, so mayonnaise past that date is usually safe, but may not be as good. A use-by date is different: never eat food after it.

What should I look for before using mayonnaise?

Separated oil, a yellower colour, or a sour smell mean it should go.

Sources

Contains public sector information licensed under the Open Government Licence v3.0.

Checked on 2 November 2026. This is an independent tool and not official advice. See sources and method.

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