If you've ever picked up a bottle of olive oil and gone hunting for a harvest date instead of a best-before date, you already understand something most shoppers don't: with olive oil, freshness is the whole story, and the standard date on the label often doesn't tell you what you actually need to know.
Best-before tells you almost nothing
A "best before" date on olive oil is typically calculated from the bottling date — usually somewhere between 18 and 24 months out. The problem is that bottling can happen a long time after the olives were actually pressed. Oil is frequently held in large stainless steel storage tanks, sometimes for many months, before it's finally bottled and shipped. A bottle can be well within its printed best-before window and still contain oil that was pressed well over a year earlier.
Olive oil isn't like wine or cheese—it doesn't improve with age, and there's no equivalent of "ageing" that adds complexity or value over time. From the moment olives are pressed, the resulting oil begins a slow, one-directional decline: flavour compounds break down, aromatic intensity fades, and polyphenol antioxidant content steadily drops. Heat, light, and oxygen exposure all accelerate that decline further, whether the oil is sitting in a bulk tank or an opened bottle on your bench.
The upshot is that two bottles can both be "in date" according to their best-before stamp and still taste like meaningfully different products, purely because of how long ago the oil inside was actually made.
The harvest date is the honest number
The harvest date tells you when the olives were picked and pressed—which is the number that actually determines how fresh, flavorful, and nutrient-rich the oil is likely to be right now. It's a far more useful piece of information than a best-before date calculated from an unknown bottling point, and it's the reason serious, quality-focused producers around the world have started printing it clearly and prominently on their labels.
We do the same with every Olio Nuovo release. Each bottle is tied to a specific harvest, pressed at Bylands Estate on the same day the fruit was picked, so the date on the label is a genuine, verifiable fact about that oil — not a generic shelf-life estimate.
How much difference does time actually make?
Fresh-pressed extra virgin olive oil is generally at its best within 12–18 months of harvest, assuming it's stored properly (cool, dark, and sealed) after that point. Within that window, you can expect:
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Stronger, more distinct grassy and peppery notes
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Higher retained polyphenol content, which is part of why fresh extra virgin olive oil is often recommended as a daily addition to a balanced diet
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A cleaner, more vibrant finish, rather than the flatter, more neutral taste that comes with age
Beyond that window, the oil doesn't become unsafe to use — it simply loses much of what made it worth choosing over a cheaper, more generic option in the first place.
What to actually look for at the bottle
When you're comparing bottles side by side, a few simple habits make a real difference:
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Look for a harvest date, not just a best-before date. If a producer isn't willing to tell you when the olives were picked, that's worth noting.
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Favor the most recent harvest available, rather than assuming any "extra virgin" bottle is equivalent.
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Once opened, store the bottle away from heat and light, and aim to use it within a few months—freshness continues to matter after purchase, not just before it.
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Buy a size you'll actually get through quickly. A large bottle that sits open for six months loses more than a smaller one used up in six weeks.
Check the current harvest date on our latest release—shop Olio Nuovo.
