Why storage matters
Olive oil is a living product. From the moment the oil is pressed, a slow breakdown of polyphenols, aromatic compounds and other sensitive substances begins. Correct storage slows that process.
Poor storage, for example next to the stove or in a clear container on the windowsill, can accelerate breakdown considerably.
Three things to avoid
Light. UV light breaks down polyphenols and can give the oil a rancid taste. Choose dark bottles or store the bottle in a cupboard.
Heat. Temperatures above room temperature accelerate oxidation. Store the oil in a cool place, ideally in a pantry or similar.
Air. Oxygen drives oxidation. Always close the bottle properly after use. A half-empty bottle with a lot of air inside will go rancid faster than a full one.
How long does olive oil keep?
An unopened bottle of good quality typically stays fresh for 12–18 months after pressing, depending on storage and polyphenol content. Oil with a high polyphenol content generally keeps longer, since the polyphenols act as natural antioxidants.
Once opened, the oil should be used within a couple of months for best taste and content.
Practical tips
Store the bottle in the pantry or a kitchen cupboard, not on the counter next to the stove. If you buy larger bottles, it may be worth decanting a small amount into an everyday bottle and keeping the rest in a cool, dark place.
Avoid storing olive oil in the fridge. It won't damage the oil, but it can turn cloudy and change consistency. This is harmless but unnecessary.