Ever found a forgotten can of craft beer lurking at the back of a cupboard and wondered whether drinking it would be a brave act or a terrible mistake? The good news is that beer doesn’t usually “go off” in quite the same way as milk or fresh food, but it definitely changes with age.
So, does craft beer go off? Yes, in the sense that its flavour, aroma and character can deteriorate. But there is a little more to it than simply checking the date on the can.
Here’s what actually happens to beer over time, why some styles are much more sensitive than others, and how to store your beer so that every pint tastes as close as possible to the way the brewer intended.
What Does It Actually Mean When Beer “Goes Off”?
When we talk about beer going off, we’re usually talking about quality rather than safety.
Most conventional beer is actually a fairly difficult environment for unwanted microorganisms. Alcohol, hops, acidity, carbon dioxide and low oxygen levels all help discourage microbial growth. A review of brewing microbiology published in Microbiology and Molecular Biology Reviews explains how these different factors work together to make beer naturally resistant to many microorganisms.
That doesn’t mean beer can never spoil. Wild yeast and certain bacteria can cause unwanted sourness, haze and strange flavours if contamination occurs. But with properly produced and packaged beer, the more common problem is much simpler: the beer gets old.
And old beer often tastes rather different from fresh beer.
Best Before Doesn't Mean Bad After
First, that date on your can or bottle isn't necessarily an instruction to pour the beer down the sink the following morning.
In the UK, the Food Standards Agency makes an important distinction between a use-by date, which relates to safety, and a best-before date, which relates to quality. Food and drink can still be safe after a best-before date, although it may no longer be at its best.
For beer, that means an unopened can a little past its best-before date isn't automatically bad.
The better question is: will it still taste as good as it should?
That depends on the beer, its age and, crucially, how it has been stored.
Oxygen: Great for Us, Not So Great for Beer
One of the main things that changes beer as it gets older is oxidation.
Brewers work hard to keep unwanted oxygen out of finished beer, but tiny amounts can still be present. Over time, chemical reactions gradually change its aroma and flavour.
According to the Cicerone Certification Program, ageing beer can lose hop flavour and aroma while developing flavours associated with honey, caramel, paper or wet cardboard. See Cicerone's guide to common off-flavours in beer
That cardboard comparison might not sound particularly appetising, but it's a useful one. If you've ever opened an old beer and thought it tasted strangely flat, dull or vaguely sweet despite still being carbonated, oxidation may be the culprit.
It isn't necessarily dangerous. It just isn't the beer the brewer wanted you to experience.
Heat Speeds Everything Up
If you want your beer to stay fresh, temperature matters.
Beer ages much more quickly when it is warm. Cicerone notes that non-refrigerated storage accelerates the development of off-flavours, while beer kept cold stays fresh for longer. It also advises against allowing beer to reach temperatures above 25°C because flavour deterioration becomes much faster. See Cicerone's beer storage guidance
That's why leaving a box of beer for weeks in a hot conservatory, sunny kitchen or car boot is not a great plan. Repeated or prolonged warm storage is the biggest concern.
For everyday home storage, cool and consistent wins.
Should You Keep Cans of Craft Beer in the Fridge?
Ideally, yes, particularly if they're hoppy.
CAMRA recommends cool storage for take-home beer and notes that a dedicated beer fridge is particularly useful for hop-forward styles such as IPAs, DIPAs and pale ales because their aromas and flavours can deteriorate relatively quickly in unsuitable conditions.
No spare beer fridge? Don't panic.
A cool, dark cupboard is much better than somewhere warm or sunny. The key is keeping the beer away from heat and avoiding buying more fresh, hop-heavy beer than you're likely to drink in the near future.
Which brings us to an important point.
Hoppy Beer Really Does Like to Be Drunk Fresh
That IPA you've been “saving for a special occasion” might actually be getting less special while you wait.
Hop-forward beers rely heavily on fresh aromas and flavours. Those bright citrus, tropical fruit, resin, pine or stone-fruit characteristics gradually fade as the beer ages.
The Brewers Association's style guidance specifically describes IPA hop character as something that should be fresh and evident, with oxidised or aged character considered undesirable.
Cicerone similarly notes that hoppy beers such as IPAs can begin showing flavour changes sooner than many other packaged beers, even when refrigerated.
In other words, don't treat craft beer like a bottle of vintage wine.
Sometimes the best occasion for drinking a fresh IPA is simply now.
Sunlight Is Another Beer Enemy
Temperature isn't the only reason to keep beer somewhere dark.
Light can react with compounds derived from hops and produce the famously unpleasant “lightstruck” or “skunky” aroma associated with badly stored beer.
And it can happen surprisingly quickly.
Cicerone says green or clear bottles can develop lightstruck flavours after just a few minutes of exposure to the right wavelengths of light. Brown glass offers considerably more protection, while cans block light completely.
It's one reason cans are such a good package for craft beer. Along with being convenient and recyclable, they create a complete barrier between the beer and damaging light.
So if you've got cans, keep them cool. If you've got bottles, keep them cool and dark.
But Can't Some Beers Improve With Age?
Here's where beer gets interesting.
Most beers are brewed to be enjoyed fresh, but there are exceptions.
Big, strong, malt-led beers can sometimes develop pleasantly with careful ageing. Barley wines and imperial stouts are classic examples. Over time, their flavours can shift towards richer caramel, dried fruit, sherry-like or other mature characteristics.
Cicerone suggests that high-alcohol, full-bodied beers with strong malt character are among the styles more likely to age successfully.
But that doesn't mean stronger automatically equals better with age. Ageing beer is essentially allowing its flavour to change deliberately, and whether that change is an improvement is partly a matter of taste.
But as a rule of thumb your fresh pale ale probably isn't crying out for five years in the cellar.
What About Draught and Cask Beer?
Beer freshness matters just as much at the pub.
Keg beer lives in a closed dispense system and, when properly stored and served, is protected from much of the oxygen exposure that causes rapid deterioration. But the equipment between the keg and your glass matters enormously.
Poorly maintained beer lines can allow microorganisms and deposits to build up, creating sour, buttery or otherwise unpleasant flavours. The Brewers Association's Draught Beer Quality Manual places regular line cleaning and proper maintenance at the heart of good draught beer quality.
Cask beer is a little different because it is a living, conditioned product.
CAMRA explains that cask-conditioned beer continues developing in the pub cellar and needs careful temperature control, settling and handling.
Once a cask is in service, exposure to oxygen means its condition won't last indefinitely. That's part of the magic of great cask beer, but it also explains why turnover and good cellar management matter so much. A beautifully kept fresh pint of cask ale can be glorious. The same beer hanging around for too long is a very different experience.
How Can You Tell If Beer Has Gone Bad?
Start with the obvious signs.
If the packaging is damaged, leaking, unusually swollen or appears compromised, don't drink it.
For an intact beer that's simply getting old, your senses are usually the giveaway. Depending on the cause, you might notice:
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muted or missing hop aroma
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papery or cardboard-like flavours
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an unexpected sweet, caramel-like character
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a skunky aroma from light exposure
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unusual sourness where the beer isn't meant to be sour
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unexpected haze, over-carbonation or strange aromas that don't fit the style.
Remember, though, that cloudy beer isn't automatically faulty. Plenty of modern craft beers are intentionally hazy, while bottle-conditioned beers can naturally contain yeast sediment.
Context matters.
Five Simple Rules for Storing Craft Beer
You don't need your own temperature-controlled beer vault. Just remember a few basics.
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Keep it cool – Refrigeration is ideal for most packaged beer, particularly hoppy styles.
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Keep it dark – This is especially important for bottled beer.
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Drink hop-forward beers sooner rather than later – Their biggest attraction is often their fresh hop character.
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Check the best-before date, but don't treat it like a use-by date – It tells you about expected quality, not an instant switch from “good” to “bad”.
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Buy from somewhere you trust – Storage before the beer reaches your fridge matters too.
And that last point is one of the pleasures of buying beer directly from an independent brewery. You know where it came from, you can discover when and how it was brewed, and there are fewer mysteries about the journey between brewery and glass.
Fresh Beer, Drunk the Way It Was Intended
Beer doesn't suddenly self-destruct at midnight on its best-before date. But it is a fresh product, and time, oxygen, heat and light can all gradually change what is in your glass.
At Tūn Brewing, we're rather fond of beer tasting the way we intended when we brewed it. Buying directly from an independent brewery is a great way to get closer to the source, discover more about what's in your beer and enjoy it at its best. Explore Tūn Brewing and our beers here.
So, have you got a mystery can hiding at the back of the cupboard, or is it time to start making a little more room in the fridge?
