Why the harvest date tells you more than the best-before

Olive oil is closer to fresh fruit juice than to wine. It does not improve in the bottle. From the moment the olives are pressed, the grassy aroma, the green colour and that peppery catch at the back of the throat all begin to soften and fade. A best-before date, typically set 18 to 24 months after bottling, tells you almost nothing about how much of that freshness remains. Two bottles sitting side by side on the same shelf, both stamped "best before December 2026", can be more than a year apart in age. The harvest date is the honest number.

This is why a bottle from the most recent harvest is usually worth a little extra. It is also why an unusually short best-before window is not always bad news: it often means the oil was bottled recently rather than left to sit in a warehouse.

How to spot the harvest date on a label

Producers print it in several different ways, so it helps to know what you are looking at.

• Harvest: November 2024 — the most useful format, giving both month and year. The earlier in the season, the greener and more pungent the oil tends to be.
• Harvest 2024/25 or Raccolta 2024 — common on Italian and Greek bottles, meaning the olives were picked between roughly October 2024 and January 2025.
• Bottled in or packed in — tells you when the oil went into the bottle, not when the fruit was picked. Better than nothing, but a weaker signal.
• Best before end 2026 with no harvest date at all — you are guessing. In a deli, ask the staff; in a supermarket, you may simply have to look elsewhere.

If only a year is given, assume the earlier part of that season. And be sceptical of a harvest date that never seems to change from one year to the next.

What is fresh in the UK, and when

Knowing the hemisphere helps you buy well all year round. Northern hemisphere olives — Spain, Italy, Greece, Portugal, France, Croatia, Turkey, Tunisia — are picked from around October to January. Those oils generally reach UK shelves from December onwards and are at their brightest through to about the following autumn.

Southern hemisphere producers — Australia, South Africa, Chile, Argentina, New Zealand — harvest in their autumn, roughly April to July. Their oils arrive here from around July, which means that in a British summer the freshest bottles on the shelf are often from the southern hemisphere rather than the Mediterranean. Neither is better; a fresh oil from either side of the world beats a tired one from the other.

What else the label is telling you

Extra virgin means the oil was extracted mechanically, without chemical refining, and met the acidity and taste standards for that grade. It says nothing at all about age, so a tired extra virgin is still extra virgin.

Cold extracted or cold pressed means the paste was kept below roughly 27°C during extraction, which helps preserve aroma and antioxidants. A named region or a protected designation — PDO or PGI — tells you about origin and method, which is useful, but again it is not a freshness guarantee. The harvest date remains the one line that dates the fruit itself.

Storing and using it in a British kitchen

Buy in quantities you will actually use. A litre of everyday oil for roasting and frying is sensible; a £15 half-litre of something peppery is better bought in a smaller bottle if it will only be drizzled over salads and bread.

• Keep oil in a cool, dark cupboard, well away from the oven, hob and radiator. Light and heat are the two great enemies.
• Decant a small bottle for the table and keep the rest sealed. Every time you open a large container, you let in air.
• Use an opened bottle within three or four months for the best flavour. Fridge storage is fine for long-term keeping — the oil will thicken and cloud, then return to normal at room temperature.
• Finish with the good stuff, cook with the rest. Drizzle fresh, peppery oil over tomatoes, mozzarella, grilled fish, beans, soups and warm bread after cooking, not before.
• Extra virgin oil is perfectly stable for home frying. Its smoke point sits comfortably above the temperatures you use for sautéing, roasting and shallow frying.

A quick test at the kitchen table

Pour a spoonful into a small glass, cup it in your hands to warm it slightly, and smell before you taste. Expect green grass, artichoke, tomato leaf, almond or a hint of cut hay. Then sip: a peppery tickle at the back of the throat is a sign of a fresh, robust oil rather than a fault.

If the aroma is flat, waxy or reminds you of crayons, the oil is past its best — but do not pour it away. Use it for roasting trays of vegetables, frying onions or greasing a tin, where the finer notes would be lost anyway. Save the fresh bottle for the dishes where you will actually taste it.