Can cider go bad?

Yes, cider can go bad: it slowly loses quality, and faster once the bottle is open. Air lets cider oxidise and can turn it stale or vinegary, because vinegar bacteria need oxygen. A best-before date on cider is about quality, not safety, and it only holds if the bottle is stored as the label says.

Updated 2026-10-02

Key facts

Best before means quality. UK guidance says "best before dates relate to quality", and after the date food "is usually safe to eat but may not be of the same quality". [1]
Storage matters. The same guidance notes that the label tells you how to store a product, and that poor storage can reduce quality before the date. [1]
Oxygen is the main enemy. A Pacific Northwest extension guide says "cider is more susceptible than wine to oxidation", which forms "undesirable chemicals such as acetaldehyde, ethyl acetate, and acetic acid (vinegar)". [2]
Vinegar bacteria need air. Acetic acid bacteria turn alcohol into acetic acid and need oxygen to do it. [3]

How can you tell if cider has gone off?

After the best-before date, UK guidance suggests using sight, taste or smell to judge a product. [1] For cider, the usual signs are:

A sharp, vinegary smell or taste, from acetic acid formed by oxidation. [2]
Off, stale flavours from the other oxidation products, acetaldehyde and ethyl acetate. [2]
Unexpected fizz or pressure in a still or sweet cider. Leftover sugar and live yeast can start a second fermentation in the bottle; the guide warns this can even make bottles explode, which is why makers pasteurise or sterile-filter sweetened cider. [2]

Haze or sediment alone is not a fault: a bottle-conditioned cider keeps live yeast in the bottle on purpose. [2]

How should you store cider?

Unopened: follow the storage instructions on the label. [1]
Opened: reseal the bottle to limit air, since oxygen drives both oxidation and the vinegar bacteria, and follow any "once opened" advice on the label. [2] [3]
Check the type: pasteurised or sterile-filtered ciders are protected against refermentation, while unfiltered, live ciders keep changing in the bottle. [2] Sulphites are also used to protect cider from oxidation; see does cider contain sulphites.

Does old cider turn into vinegar?

It can. Cider vinegar is made exactly this way: acetic acid bacteria, with air, turn the alcohol in cider into acetic acid. [3] The full process is in how apple cider vinegar is made.

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Cider, perry, calvados and pommeau are alcoholic drinks. Enjoy responsibly and follow the legal drinking age where you live.

Questions

Does unopened cider expire?

Its quality changes slowly over time. Where a best-before date is given, it is about quality rather than safety, and it assumes the bottle was stored as the label says. [1]

Is cloudy cider off?

Not necessarily. Most commercial ciders are filtered to prevent sediment, but some are unfiltered or keep live yeast in the bottle, so haze or a deposit can be normal. [2]

Why do some ciders have no best-before date?

UK and EU labelling rules don't require one for drinks of 10% ABV or more, or for wines and similar products made from fruit other than grapes. [4] [5]