Does Olive Oil Go Bad? Shelf Life, Storage and How to Tell
Yes, olive oil goes bad, though not in the way milk does. Over time it oxidises and turns rancid, losing its fresh flavour and developing stale, waxy notes. The North American Olive Oil Association (NAOOA) says a well-stored, unopened bottle can last about 1½ to 2 years, and that an opened bottle is best used within 2–3 months. Here’s how to read the date, store your oil and tell when it’s past its best.
How long does olive oil last?
| Situation | Guideline |
|---|---|
| Unopened, cool and dark | About 18–24 months from bottling; follow the best-by date |
| Opened | Use within about 2–3 months for the best flavour |
| Heat, light or air exposure | Shortens shelf life; oil can fade within weeks on a sunny counter |
Under International Olive Council standards and the NAOOA labelling guide, the best-before date should be no more than 2 years from bottling, and often less. The NAOOA considers the best-by date more useful than the harvest date because it takes into account the oil’s variety, quality and blending. Once you open the bottle, air starts to work on the oil, so plan to finish it within a couple of months.
What makes olive oil go bad?
The NAOOA sums it up: the enemies of olive oil are heat, light and air. Oxygen reacts with the fats and flavour compounds in the oil, a process that heat and light speed up. Olive oil keeps better than many seed oils, thanks to its high proportion of monounsaturated fat and its natural antioxidants, but it doesn’t last forever.
How to tell if olive oil is rancid
- Smell it. Rancid oil smells stale, waxy or like crayons, putty or old nuts, instead of fresh, green or fruity.
- Taste a little. Fresh extra virgin oil tastes fruity and may be bitter or peppery. Rancid oil tastes flat, greasy or like stale walnuts.
- Ignore the colour. Colour isn’t a reliable guide to quality or freshness; good oils range from golden to green.
- Cloudiness isn’t a fault. Oil can turn cloudy or solidify in the cold and clears again at room temperature. Unfiltered oils can also look hazy; see filtered vs unfiltered olive oil.
The NAOOA notes that oxidised oil can be used for household purposes but should not be eaten. Rancid oil won’t make food taste good, so it’s not worth cooking with. If an oil smells musty or mouldy, or has anything growing in it, throw it away.
How to store olive oil
- Keep it cool and dark. A cupboard away from the stove and oven is ideal. Avoid the windowsill and the shelf above the cooker.
- Close the cap after each use to keep air out.
- Choose protective packaging. Dark glass, tins and lined boxes protect oil from light. See olive oil tin vs glass bottle.
- Buy a size you’ll use. A 500 ml bottle you finish in a month or two stays fresher than a large tin opened for a year.
- Decant carefully. If you use a pourer or a small cruet, refill it from the main bottle, wash and dry it between batches, and don’t top up old oil with new.
Should you keep olive oil in the fridge?
Usually not. The NAOOA recommends a cool, dark cupboard instead. In the fridge, olive oil turns cloudy and thick and may solidify; it returns to liquid at room temperature, but repeated warming and cooling can cause condensation in the bottle. The exception is homemade oil with garlic or herbs, which must be refrigerated and used within 4 days, as the CDC advises. Our olive oil bread dip explains why.
Does extra virgin last longer than regular olive oil?
Not necessarily. Extra virgin oil contains more natural antioxidants, which help protect it, but it also has more delicate flavours to lose. Refined olive oil has less flavour to start with, so staleness is less obvious. Either way, follow the best-by date and use an opened bottle within a few months. Learn more about the grades in extra virgin vs virgin olive oil.
Our Rapti Koroneiki olive oil comes in a 500 ml bottle, a practical size for finishing while it’s fresh. Browse the Greek olive oil collection or read choosing Greek olive oil.
Sources
- NAOOA: If you don’t open the bottle, will olive oil stay fresh?
- NAOOA: Olive oil harvest date vs best-by date
- NAOOA: How long does olive oil last?
- NAOOA: A consumer’s guide to olive oil (PDF, June 2024)
- CDC: Botulism prevention, home-canned foods and homemade oils with garlic or herbs
Does olive oil go bad: frequently asked questions
How long does olive oil last once opened?
For the best flavour, use an opened bottle within about 2–3 months, kept tightly closed in a cool, dark place.
How long does unopened olive oil last?
About 18–24 months from bottling if stored somewhere cool and dark. Follow the best-by date on the bottle.
Can you use expired olive oil?
Smell and taste it. If it smells stale, waxy or like crayons, it’s rancid and won’t taste good; the NAOOA says oxidised oil shouldn’t be eaten.
Should olive oil be refrigerated?
Plain olive oil is best in a cool, dark cupboard. Homemade oils with garlic or herbs must be refrigerated and used within 4 days.
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