Can you eat yogurt past its date?

Yes, sometimes, but the first question is not how many days have passed. It is what the product is and which date appears on the pot.

This article follows UK rules and guidance. Other countries may define yogurt differently or give different advice after a date, so international readers should also check their local authority’s guidance.

Start with the product name

In the UK, yogurt is a protected dairy designation. The name is reserved for milk products, meaning products derived exclusively from milk, although ingredients needed to make the product may be added as long as they do not replace a milk constituent.

That distinction matters. A fermented oat, soy or coconut dessert may look and taste similar, but it is not the same legal product and does not automatically have the same acidity, starter cultures or shelf-life behaviour. Its own date label and storage instructions are the only safe basis for a decision.

Fruit yogurt is different again. It can still be a dairy yogurt, but the complete recipe, processing method and packaging determine whether the manufacturer applies a use-by or best-before date.

The Codex standard for fermented milks identifies the characteristic yogurt cultures as Streptococcus thermophilus and Lactobacillus delbrueckii subsp. bulgaricus. That international definition is useful microbiologically, but the wording on the individual UK pot still decides what you may do after the date.

Then check whether it says use by or best before

The Food Standards Agency describes the distinction in deliberately plain language:

• Best before can be read as “best quality before”. It concerns quality.
• Use by can be read as “use by or you may get sick”. It concerns safety.

Do not eat yogurt after a use-by date, even if it looks and smells normal. The microorganisms that cause food poisoning cannot always be detected with your senses.

After a best-before date, the FSA allows sensory checks because the date is not a safety deadline. This only makes sense if the pot has been stored as instructed and its packaging is intact.

What the pot says or shows	What it means	What to do
The use-by date has passed	The manufacturer’s safety limit has passed	Bin it. Do not smell or taste it as a safety test
The best-before date has passed, but the unopened pot is intact and correctly chilled	Quality may have declined	Check the appearance and smell, then taste only if there are no warning signs
The seal is lifted, torn or leaking	The protective barrier has failed	Bin it
The lid is swollen or domed	Gas may have built up inside	Bin it unopened
Any mould is visible	The product is spoiled	Bin the whole pot
The smell is clearly yeasty or unpleasant	Spoilage is likely	Bin it
A little clear or pale liquid has separated	This can be normal whey separation	Stir it in only if the label rules and all other checks are satisfied

The UK market has not been shown to have fully switched

The claim that most yogurt sold in the UK now carries a best-before date is not supported by a current market-wide audit.

WRAP’s latest public retail survey was published in November 2022 and reflected products checked in 2021. It found a noticeable increase in milk and yogurt carrying best-before dates, but said that most yogurts and milk on the market still carried a use-by date.

Important retailer changes followed:

• Co-op announced on 22 April 2022 that it would move its entire own-brand yogurt range to best-before dates, starting in May and completing the rollout by October 2022.
• Tesco announced on 24 April 2023 that it would change more than 30 yogurt lines, with the switch phased in by the end of June 2023.

Those decisions show a strong shift within supermarket own-label ranges. They do not establish that best-before dates now account for a majority of all yogurt sold in the UK. Until a newer market-wide survey is published, the accurate description is that the market remains mixed.

There is no fixed UK grace period after a best-before date

I found no FSA or WRAP consumer guidance that gives yogurt a set number of extra days after a best-before date.

The widely repeated “two to three weeks” is not an official UK recommendation. Neither is “a week or two”. This conclusion is specific to the UK and should not be presented as a worldwide rule, because authorities in other countries may publish a different order of magnitude.

Food and You 2 is an official statistics survey of self-reported knowledge, attitudes and behaviour. Its findings describe what people say they do. They are not food-safety guidance and must not be turned into a safe grace period after either type of date.

Where the two-to-three-week claim goes wrong

The likely confusion is between product shelf-life testing and consumer guidance.

A manufacturer or retailer can test a specific recipe, process and pack to decide whether it needs a use-by date, whether a best-before date is appropriate, and how far away that date can be set. WRAP explicitly tells businesses to extend product life only as far as their own safety and quality evidence allows.

Co-op said its testing showed that its yogurts remained safe beyond the printed date and that quality was the main thing that changed. It did not publish a universal extension, a detailed protocol or a statement that every yogurt remains acceptable for another two or three weeks.

Tesco likewise announced a change of date label for more than 30 lines, not a household rule telling consumers to add a fixed number of days.

The defensible conclusion is therefore:

Shelf-life tests can justify a best-before date for a particular product. They do not justify adding 14 or 21 days to every pot in the fridge.

Why genuine dairy yogurt can be relatively robust

Yogurt is made by fermenting milk. Its starter cultures convert lactose into lactic acid, lowering the pH.

An FSA research review describes yogurt fermentation as producing a pH of approximately 4.0 to 4.6. That is a range, not a fixed value. The recipe, cultures, manufacturing process and storage conditions all affect the final product.

The directly accessible FAO text of Codex CXS 243-2003, marked as the 2010 revision, sets a microbiological criterion of at least 10 million colony-forming units per gram for the microorganisms forming the yogurt starter culture. It says those cultures should remain viable, active and abundant up to the date of minimum durability, unless the product has been heat-treated after fermentation. The current Codex index lists the standard with a 2024 revision date, but the stable PDF used for these two specific details is the earlier text.

Acidity and fermentation help explain why a correctly made dairy yogurt can retain acceptable quality after a best-before date. They are hurdles to microbial growth, not guarantees of safety. They do not cancel a use-by date, repair a damaged seal or compensate for poor refrigeration.

This is also why the reasoning should not be transferred automatically to custards, cream desserts, rice puddings or plant-based alternatives. They are different products with different formulations and risk assessments.

Once opened, follow the manufacturer’s instruction

There is no official UK after-opening period that applies to every yogurt.

UK labelling rules require special storage conditions and instructions where they are needed. WRAP’s yogurt guidance treats the period after opening, known as the product’s “open life”, as product-specific. It even recommends removing an open-life statement when it is not needed for safety or quality, and extending it where evidence supports doing so.

Follow any wording such as “once opened, keep refrigerated and consume within X days”. Keep the pot covered, use a clean spoon and continue to respect its use-by or best-before date. Opening the pot does not create a new universal countdown.

What about children and other higher-risk groups?

Official UK consumer guidance lists young children, pregnant women, older people and people with an underlying health condition among those at increased risk of food poisoning.

That consumer guidance does not attach a numerical age to “young children”. Separate Department for Education guidance for early-years providers is explicitly written for children aged 5 and under and explains that babies’ and young children’s immune systems are less developed than adults’.

The age of 5 should therefore not be presented as a universal FSA definition covering every food-safety context. It is the scope used by this early-years guidance. It does not create a separate rule for best-before dates, but it supports a more cautious approach to chilling, packaging and label instructions for this age group.

Keep the fridge between 0 and 5°C

Official UK food-safety guidance says a domestic fridge should be between 0 and 5°C. It also advises checking that the temperature is 5°C or below, preferably with a separate fridge thermometer.

The date on a yogurt assumes that it has been stored according to the label, so a warm fridge or a break in the cold chain can shorten its usable life. If a yogurt has been left warm for an uncertain period, do not treat a future best-before date as proof that it is still suitable.

Better labels can prevent avoidable waste

WRAP’s research shows that consumers often treat a best-before date as a disposal date, even though it is intended as a quality marker.

When Tesco announced its changes in 2023, it cited WRAP data estimating that UK households wasted 54,000 tonnes of yogurt a year, around 9% of purchases. Half was reportedly discarded in unopened packs, and the date was cited as the reason for much of that waste.

These figures explain why retailers are reviewing unnecessary use-by dates. They do not weaken the meaning of a use-by date when one is still printed on the product.

How to stop binning yogurt that was still good

The problem is often not understanding the date. It is noticing it in time.

A multipack bought on offer slides behind the milk and resurfaces later. Meanwhile, a perfectly good pot can go in the bin on reflex because yesterday’s best-before date looks alarming.

That is where Date Limite helps. Scan the barcode on the multipack, record the date once, and get a reminder before it arrives. You eat the yogurts while they are at their best, and you make a deliberate decision about older pots instead of guessing in front of an open fridge.

If the difference between the two kinds of date is still not clear, our article Use-by vs best-before: the difference sets it out in full.

Key points

• In UK law, yogurt is a milk product. Plant-based alternatives need their own assessment.
• A use-by date is about safety. Do not eat the yogurt after it.
• A best-before date is about quality, so sensory checks may be appropriate after it.
• The latest public market-wide WRAP survey found that most yogurts still carried use-by dates, although major retailers later switched substantial own-label ranges.
• No UK authority gives yogurt a universal extra one, two or three weeks after a best-before date.
• Shelf-life tests validate a particular product and date label, not a fixed household grace period.
• Yogurt typically reaches pH 4.0 to 4.6, but acidity is only one part of its safety and stability.
• Once opened, follow the manufacturer’s instruction rather than assuming a universal time limit.
• General UK consumer advice says “young children”; separate early-years guidance covers children aged 5 and under.
• Keep chilled food between 0 and 5°C.

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Sources

• GOV.UK and Food Standards Agency, Best before and use-by dates
• Food Standards Agency, “Best quality before” and “use by or you may get sick”
• GOV.UK and Food Standards Agency, Food labelling: giving food information to consumers
• UK Supreme Court, Dairy UK Ltd v Oatly AB, judgment
• WRAP, Retail survey on date labels and open-life instructions
• WRAP, Label better, less waste: Yogurt
• WRAP, Citizen insights on use-by and best-before dates on dairy products
• Co-op, Best-before approach for its own-brand yogurts
• Tesco, Tesco changes yogurt labelling to cut down on food waste
• Food Standards Agency Research and Evidence, pH range reported for yogurt fermentation
• GOV.UK and Food Standards Agency, vulnerable groups and fridge temperature
• Department for Education, Food safety advice for children aged 5 and under
• GOV.UK and Food Standards Agency, Food and You 2 official statistics collection
• Codex Alimentarius, current standards index
• FAO, Standard for Fermented Milks, CXS 243-2003, accessible PDF marked as the 2010 revision