How Long Does Milk (Opened) Last in the Fridge?
Written by Jordan Morley · Storage times from the USDA FoodKeeper database · Last updated 28 October 2026
Pasteurisation is a brief heat treatment and doesn't make milk sterile — bacteria that survive it slowly multiply even at fridge temperature, which is why milk is dated rather than given an indefinite shelf life.
Storage tips for milk (opened)
- Fridge at 0–5°C. A fridge thermometer is the cheapest food-safety upgrade — many home fridges run warmer than their dial suggests.
You can also check the calorie content of milk (opened) alongside its safety information. Want to know exactly what's in your food? Our ingredient checker covers E-numbers, allergens and vegan status.
Why this time limit?
Pasteurisation is a brief heat treatment and doesn't make milk sterile — bacteria that survive it slowly multiply even at fridge temperature, which is why milk is dated rather than given an indefinite shelf life. That same vulnerability is also why milk is one of the few fridge staples worth freezing: at -18°C those bacteria stop multiplying entirely, pausing the clock for up to 3 months (expect some fat separation on thawing — a good shake usually fixes it).
Milk: fridge vs. freezer
| State | Storage life |
|---|---|
| Unopened, in the fridge | Until the printed use-by date |
| Opened, in the fridge | 3–5 days, even if the use-by date is later |
| Frozen | Up to 3 months — leave headspace, it expands as it freezes |
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Store it properly
Airtight food storage containers
The right container keeps milk (opened) fresher and stops fridge smells migrating.
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More storage essentials
Vacuum food sealer
Removes the air that speeds spoilage — extends shelf life by days.
Check Price →Airtight glass containers
Fridge, freezer and microwave safe — one less transfer step.
Check Price →Milk (Opened): the other answers on this site
| Question | Short answer (links to the full page) |
|---|---|
| In pregnancy (Milk) | Safe |
| In the freezer (Milk) | Yes — freezes well (best quality for 3 months) |
| Left out overnight (Milk) | No — throw it away (limit about 2 h) |
| Past the date on the label (Milk) | No — use-by means use by |
Common questions
How long does milk (opened) last in the fridge?
until the use-by date in a fridge running at 0–5°C (USDA FoodKeeper guidance). After that, quality and safety both start to slip, and because the bacteria that cause food poisoning are invisible, ‘it seems fine’ is not a reliable test. When in doubt, throw it out.
How can I tell if milk (opened) has gone off?
A sour smell, lumps or curdling, a changed taste or any mould (other than on hard cheese) mean it should go. Do not rely on this alone: the time guideline matters even when everything looks fine.
Can I freeze milk (opened) to keep it longer?
Yes. For best quality, freeze it for around 3 months; it stays safe beyond that because freezing halts bacterial growth, and only texture and flavour decline.
Does my fridge temperature really matter?
Yes. These times assume a fridge at 0–5°C, which is what the Food Standards Agency says to set it to. Bacteria grow faster in a warmer fridge, and many fridges run warmer than their dial suggests, so a cheap fridge thermometer is worth having.
Related answers
Primary source: USDA FoodKeeper.
General information only, not medical advice: see the medical disclaimer. Feeling unwell after eating something? Contact NHS 111 or your GP.