Prep

How long do crisps last?

FoodKeeper gives crisps 2 months unopened, as a US guide to quality. Once opened, that's 1 to 2 weeks in the cupboard.

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 the bag sealed. Once it's open, roll it tightly and clip it. Moisture makes them soft, and oil makes them stale.

Keep it cool and dry. 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. Reseal opened packs, or decant them into something airtight.

What to look for

Soft crisps have only lost their crunch. A bitter or paint-like smell means the oil has gone rancid.

USDA says spoiled food develops an off smell, taste or texture. The FSA says you can smell food with a best before date to see if it has spoiled, but that the sniff test isn't safe for food with a use-by date.

Worth knowing

They're a short-life item, not a long-term store. FoodKeeper says to go by the date on the pack, and gives 2 months from purchase and 1 to 2 weeks once open.

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 do crisps last unopened?

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

How long do crisps keep once opened?

1 to 2 weeks in the cupboard. FoodKeeper gives no fridge figure.

Can I eat crisps after the best before date?

Best before is about quality, so crisps past that date are 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 crisps?

Soft crisps have only lost their crunch. A bitter or paint-like smell means the oil has gone rancid.

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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