Olive oil shelf life: how long it lasts and how to store it

Last reviewed 1 September 2026.

Olive oil does not spoil the way milk spoils. It goes stale. The question “has it gone off” is really the question “how far has it oxidised”, and unlike most kitchen questions that one has a measurable answer — a number that appears on every certificate of analysis and that you can ask for before you buy.

How long olive oil lasts

Our oils carry a shelf life of 24 months from bottling, stored at ambient temperature. No refrigeration is required or recommended.

The date printed on a bottle is a best-before date, not a safety date. Oil past it is not dangerous; it is likely to have lost the peppery, green character it had when it was pressed, which is the part you were paying for.

Once a bottle is opened, the clock speeds up, because air enters every time you pour. We do not publish a figure for an opened bottle. It depends on how much air is sitting above the oil, how warm the room is and how often the bottle is opened, and any single number would be a guess. Buy a size you will actually finish, and the question does not arise.

What actually degrades olive oil

Four things, in roughly this order of importance.

Oxygen. Every pour replaces oil with air. Peroxide value is the measurement of how far this has gone, and the legal limit for extra virgin is 20 meq O₂/kg.
Light. Ultraviolet in particular. This is the entire reason for dark glass and metallic tins, and the reason a clear bottle on a sunlit shelf is the worst packaging decision available.
Heat. The cupboard above the hob is the warmest place in a kitchen and the most common place to keep oil.
Time. Even perfectly stored, an oil’s polyphenol content declines across its life. Polyphenols are part of what gives fresh oil its bitterness and its peppery catch at the back of the throat.

How to store it

Cool, dark and sealed. A closed cupboard away from the hob beats a handsome bottle beside it.
Upright, with the cap on properly.
Do not refrigerate. It is unnecessary, and the oil will thicken or cloud. That clouding is normal, it reverses at room temperature, and it is not a sign of quality either way.
Tins and dark glass hold oil better than clear glass. For a kitchen using real volume, a tin decanted into a small bottle keeps most of the oil in the dark.
Buy a size that matches how fast you use it. A large bottle half empty for six months is worse than a small one finished in three weeks.

How to tell if it has gone stale

Smell it, then taste it. Rancid oil smells like crayons, putty or old walnuts, and tastes flat and greasy with none of the pepper at the back of the throat that fresh oil has. This is a quality problem rather than a safety one — the oil has lost what you bought it for. Trained sensory panels are looking for exactly this, alongside defects described as fusty, musty and winey.

What shelf life means on a contract

If you are buying at volume rather than by the bottle, shelf life is a term to negotiate rather than a figure to read off a label, and three things matter more than the number itself.

Ask for the pressing date, not the bottling date. Oil can be pressed in December and bottled the following autumn. Both dates are legitimate; only one tells you how old the oil is.
Ask for the peroxide value on the actual lot. It is the single number that tells you how much of the shelf life has already been spent before the goods reach you. Every lot we ship travels with a certificate of analysis giving it.
Ask how the oil was held between pressing and shipping. Storage is part of what you are buying, and it is rarely written down unless somebody asks.

Variety matters too. Koroneiki is naturally stable, which makes it a sensible choice where the oil will sit in a warehouse or travel a long route before it is sold. Chetoui is naturally high in polyphenols. We press the olives on the day they are picked, at Kairouan and Jammel, which is where the useful part of an oil’s life begins.

Ask us

Tell us the grade, format and destination and we will send a specification with the current certificate of analysis. Email sales@olyfo.com or send an enquiry.

Questions

Does olive oil go bad?

It goes stale rather than unsafe. Oxygen, light, heat and time gradually oxidise it, and it loses the peppery, green character it had when pressed. Our oils carry a 24-month shelf life from bottling, stored at ambient temperature.

How long does olive oil last once opened?

There is no single honest figure, because it depends on how much air sits above the oil, how warm the room is and how often the bottle is opened. Buy a size you will finish rather than relying on a number.

Should you keep olive oil in the fridge?

No. Refrigeration is not required and the oil will thicken or cloud. The clouding is normal and reverses at room temperature, but it tells you nothing about quality. A cool, dark cupboard is better.

How can you tell if olive oil has gone rancid?

By smell and taste. Rancid oil smells like crayons, putty or old walnuts and tastes flat, with none of the peppery catch at the back of the throat that fresh oil has.