Olive Oil Harvest Date Explained
Nikos Papadakis · Harvest Director, Messenia · Updated 2026-07-28
The harvest date is the month or season the olives were picked and milled. It is the only figure on a bottle that lets you judge how old the oil actually is. A best-before date is set by the bottler, usually 18 to 24 months after filling, and a bottle can be filled from a tank of oil that has already been sitting for a year. Northern hemisphere harvests run roughly October to January; southern hemisphere crops land April to June. Buy the most recent crop you can find, and treat a missing harvest date as a reason to choose a different bottle.
How harvest date is expressed
You will see several formats: a month and year, a crop year such as 2025/26, or simply "Harvest 2025". All are useful. What is not useful is a bottling date, which only records when the oil left the tank.
What changes as oil ages
Volatile aroma compounds go first, within months — the cut-grass and green-tomato notes fade. Phenols decline more slowly over a year or two, taking bitterness and pungency with them. Free acidity creeps up. The oil does not become dangerous; it becomes dull.
Heat accelerates all of it. A bottle stored above a stove ages several times faster than the same bottle in a cool cupboard.
Frequently asked questions
- What is a harvest date on olive oil?
- The month or crop year in which the olives were picked and milled — the true age of the oil in the bottle.
- Why do some bottles have no harvest date?
- It is not legally required in the US. Producers who pick and mill early tend to print it; blenders working from older stock usually do not.
- How old is too old?
- For most oils, more than about 18 months past harvest. High-phenolic oils hold up longer, delicate Arbequina-style oils fade sooner.
About the author
Nikos Papadakis — Harvest Director, Messenia. Nikos runs harvest logistics across forty Koroneiki groves in the Peloponnese. He has milled fruit every season since 1998 and still tastes the first paste of the day straight off the decanter.
