Prep

How long does UHT milk last?

FoodKeeper gives UHT milk 6 to 12 months unopened, as a US guide to quality. Once opened, that's 5 to 7 days 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

It stays on the shelf until it's opened. USDA explains that aseptic cartons are filled sterile, which is why they don't need a fridge. After that, treat it like fresh milk.

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

Don't use a carton that's swollen, leaking or damaged. Once it's open, a sour smell or lumps mean it's gone.

Don't use food from a swollen, leaking or damaged pack, and don't taste it to check.

Worth knowing

After opening it needs the fridge. USDA's outage chart says to throw away milk if the fridge has been above 40°F (4°C) for over 2 hours.

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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 UHT milk last unopened?

6 to 12 months, according to USDA FoodKeeper, as a guide to best quality. FoodKeeper counts this from the date of purchase.

How long does UHT milk keep once opened?

FoodKeeper gives no figure for an opened pack in the cupboard. 5 to 7 days in the fridge.

Can I eat UHT milk after the best before date?

Best before is about quality, so UHT milk 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 UHT milk?

Don't use a carton that's swollen, leaking or damaged. Once it's open, a sour smell or lumps mean it's gone.

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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