Harvest Date vs Best-By Date on Olive Oil: Which One Matters?

The harvest date matters more than the best-by date, because it tells you when the olives were picked and milled. A best-by date is chosen by the bottler and usually counts from bottling, which can happen many months after harvest. Two bottles with the same best-by date can hold oils of very different ages. Use the harvest date to judge freshness and the best-by date as a backstop.

What each date actually means

The harvest date records when the olives were picked and turned into oil. In Greece this is usually a month or a season between October and January. It is the starting point of the oil's life.

The best-by date is a date of minimum durability. In the EU, food labelling law requires it, but the date itself is set by the business that packs the food, not by a regulator (European Union, 2011). It is the packer's estimate of how long the oil will keep its expected qualities if stored well.

How best-by dates are set

Most bottlers set the best-by date 18 to 24 months after bottling. The time before bottling is not counted.

Oil is often stored in bulk tanks after milling, and a large producer may bottle from one tank across a whole year. The best-by clock starts later than the oil's own clock.

Here is how that plays out. Olives are milled in November. The oil waits in a tank and is bottled the following autumn. The bottler adds two years. The best-by date now sits about three years after harvest, so the oil can be past its best with months still showing.

A best-by date is not bad faith. It spots oil that is clearly too old. It cannot show you oil that is truly fresh.

How flavour and polyphenols change over time

Extra virgin olive oil does not improve with age. From the day it is milled, oxygen, light and heat slowly change it.

• Aroma fades first. The green notes of fresh oil, such as cut grass, tomato leaf and green almond, are volatile and soften within months.
• Bitterness and pepper soften. These come largely from phenolic compounds. As the oil ages, the phenols are used up protecting the fats from oxidation, so the bite becomes milder.
• Polyphenols decline. The rate depends on the starting level, storage temperature, light and how much air is in the bottle. An oil that starts high has more to lose before it falls below meaningful levels.
• Rancidity eventually appears. Old oil smells of crayons or stale nuts.

This is why the harvest date matters for anyone buying olive oil for its polyphenols. The EU health claim for olive oil polyphenols applies only to oil with at least 5 mg of hydroxytyrosol and its derivatives per 20 g (European Commission, 2012). An oil can meet that level at milling and fall below it later. Our guide to how long olive oil stays fresh covers the timeline in more detail.

How to read a harvest month

Harvest information appears in a few common forms.

• A single month, such as "Harvested November 2025". This is the most precise form.
• A crop year, such as "2025/26 harvest". In the Mediterranean, the harvest runs across the turn of the year, so this means olives picked from autumn 2025 into early 2026.
• A season, such as "Autumn 2025" or "Early harvest 2025". This is less precise but still useful.

EU marketing rules allow a harvest year on the label only when all of the oil in the container comes from that harvest (European Commission, 2022). A stated harvest therefore also tells you the bottle is not a blend of old and new crops.

As a working guide, a sealed, well-stored extra virgin oil is at its best within about 18 months of harvest. The closer the harvest, the more of that window you get. An October or November date also hints at an earlier, greener harvest. Our article on early-harvest olive oil explains why that matters.

What to do if only a best-by date is shown

Many good oils print only a best-by date. You can still work with it.

1. Work backwards. Subtract about two years from the best-by date to estimate the bottling date. Assume the harvest was earlier still.
2. Prefer the latest best-by date on the shelf. It usually means more recent bottling.
3. Look for a lot code. Some producers let you look up the harvest and test results from the lot code online.
4. Taste it at home. Fresh oil smells green and fruity and has some bitterness and pepper. Flat, waxy or stale oil is past its best, whatever the date says.

For the other details worth reading on a bottle, see our olive oil label guide.

How Pomoni does it

Pomoni prints the harvest month on every bottle, so you never have to work backwards from a best-by date. The oil comes from early-harvest Koroneiki olives in Greece, milled within hours of picking and cold-extracted. Each batch is tested by HPLC, and the certificate for that batch is published on our testing and certifications page. It comes in dark glass in 100, 250 and 500 mL sizes. Details for the current batch are on the Pomoni high-phenolic olive oil page.

Frequently asked questions

Sources

1. European Union. Regulation (EU) No 1169/2011 on the provision of food information to consumers. 2011. eur-lex.europa.eu
2. European Commission. Commission Delegated Regulation (EU) 2022/2104 on marketing standards for olive oil. 2022. eur-lex.europa.eu
3. European Commission. Commission Regulation (EU) No 432/2012 establishing a list of permitted health claims. 2012. eur-lex.europa.eu
4. EFSA Panel on Dietetic Products, Nutrition and Allergies. Scientific opinion on health claims related to polyphenols in olive. EFSA Journal 2011;9(4):2033. doi.org/10.2903/j.efsa.2011.2033
5. International Olive Council. Trade standard applying to olive oils and olive pomace oils, COI/T.15/NC No 3. internationaloliveoil.org