What Does 'Cold Pressed' Actually Mean? A Precise Technical Explanation

The Term Is Everywhere. The Meaning Is Rarely Explained.

'Cold pressed' appears on olive oil bottles in every grocery store. It sounds rigorous — like a precise quality guarantee. In reality it is one of the most loosely used terms in the food industry, and in the United States it has no legal definition at all.

That does not mean it is meaningless. In regions where it is regulated, cold pressed refers to something real and technically specific. But the gap between what the label implies and what it actually guarantees is wide — and understanding that gap is the difference between choosing oil based on marketing and choosing it based on what actually matters.

This post explains what cold pressed means technically, how olive oil is actually made today, why temperature matters for quality, and what the term tells you (and does not tell you) about what is in the bottle.

How Olive Oil Is Actually Made: The Modern Process

To understand what cold pressed means, you first need to know what happens in a modern olive oil mill. The process has four stages, and temperature plays a role at every one of them.

Stage 1: Crushing

Whole olives — pits included — are fed into a crusher that breaks them into a coarse paste. Modern mills typically use stainless steel hammers or discs rather than the traditional stone wheels you see in photographs. The crushing is fast and mechanical. The olive cells rupture, releasing oil droplets, water, and cellular material in a mixed paste.

Stage 2: Malaxation

This is the stage most people do not know about, and it is the most important one for understanding cold pressing.

Malaxation is the slow kneading of the olive paste. The crushed paste moves into a horizontal mixing tank and is gently churned — typically for 20 to 45 minutes. The purpose is to allow the tiny oil droplets released during crushing to find each other and merge into larger droplets that can be separated more easily. Without malaxation, most of the oil would remain trapped in the paste.

Here is the catch: oil merges and separates more efficiently at higher temperatures. Heat reduces the thickness of the oil and makes the paste easier to work with. A malaxer running at 35 degrees Celsius will produce meaningfully more oil from the same amount of olives than one running at 22 degrees. This is why many producers raise the temperature during this stage — yield goes up, and yield is directly tied to revenue.

Stage 3: Centrifugal Separation

After malaxation, the paste goes into a horizontal centrifuge called a decanter. Spinning at roughly 3,000 to 3,600 rotations per minute, it separates the paste by density into three streams: oil, water, and solid waste (called pomace). In a two-phase system, the water stays with the pomace; in a three-phase system, all three exit separately.

A vertical centrifuge may follow to remove any remaining water from the oil. The oil is then stored in temperature-controlled stainless steel tanks, typically under nitrogen gas to prevent oxidation, until it is bottled.

Stage 4: Bottling

The finished oil is filtered or left unfiltered and bottled. The packaging choice — dark glass, tin, or clear plastic — affects how quickly the oil degrades after bottling. Light is one of the primary causes of polyphenol breakdown in stored oil.

What 'Cold Pressed' Technically Means

The regulated definition of cold pressed in the European Union — the most rigorous labeling standard for olive oil in the world — ties the term directly to the temperature during malaxation and centrifugal extraction.

Under EU regulation, the term 'first cold pressing' may appear only on oil extracted using traditional hydraulic presses at temperatures below 27°C (80.6°F). The term 'cold extracted' applies to oil produced through modern centrifugal systems at the same temperature threshold. Both refer to the same underlying requirement: at no point during the malaxation and extraction process did the temperature exceed 27 degrees Celsius.

In the United States, the term has no equivalent federal standard. The USDA has established voluntary olive oil grades, but 'cold pressed' is not defined or enforced by any federal agency. A US producer can print it on any bottle without verification.

The International Olive Council, which sets global standards that many countries adopt, defines cold extraction in a way consistent with EU rules — below 27°C, modern centrifugal systems. But IOC standards are only binding in member countries that have adopted them into national law. The US has not.

Why Temperature Matters: What Heat Does to Olive Oil

The 27°C threshold is not arbitrary. It reflects real changes in oil composition that happen as extraction temperature rises.

Polyphenol Degradation

Polyphenols — the compounds responsible for olive oil's bitterness, pepper finish, antioxidant activity, and most of its documented health effects — are temperature-sensitive. A study on malaxation conditions and phenolic content found that increasing extraction temperature beyond 27°C measurably reduced the phenolic concentration in the finished oil. The relationship is not perfectly linear, but the direction is consistent: more heat, fewer polyphenols.

Research testing low-temperature malaxation specifically found that keeping the paste below 27°C during the entire extraction process preserved significantly higher concentrations of key phenolic compounds — including oleuropein derivatives and hydroxytyrosol — compared to warmer extraction in the same facilities using the same olives.

Aroma and Volatile Compounds

The fresh, grassy, slightly fruity notes in high-quality extra virgin olive oil come from volatile aromatic compounds that form when olive cells are ruptured. These compounds are especially fragile at higher temperatures — they evaporate or break down during a warm malaxation. Cold extraction preserves them. This is one reason why genuinely cold-pressed oil smells different from oil produced at higher temperatures.

Oxidation Rate

Heat accelerates oxidation — the process that makes fats go rancid. Oil extracted at lower temperatures has a lower initial oxidation level. Since EVOO grade requires peroxide values below 20 milliequivalents per kilogram (a measure of oxidation), oil produced more carefully tends to stay within grade longer and has a longer useful shelf life once opened.

'First Cold Pressed' vs. 'Cold Extracted': What the Distinction Means

You will see both terms on bottles. They sound like one is better than the other. The truth is simpler.

'First cold pressing' refers to traditional hydraulic press systems where olives are pressed through mats stacked under a press. These are largely historical now — most producers converted to centrifugal systems decades ago because they are faster, more consistent, and easier to clean.

'Cold extracted' refers to the modern centrifugal process. Under EU rules, if the centrifuge ran at or below 27°C, the producer can use 'cold extracted.' If they are using a traditional press and kept temperature below 27°C, they can say 'first cold pressing.'

Neither term is inherently superior. Both require the same temperature threshold. 'First cold pressing' on a modern bottle often just means the producer prefers the traditional-sounding language — the oil almost certainly came out of a centrifuge. The temperature is what matters, not the phrase.

For more on how the production process affects what ends up in the bottle: What Happens When Olives Sit Too Long Before Pressing.

When 'Cold Pressed' Is Meaningless or Misleading

Here are the situations where the label tells you nothing useful.

In the United States, Always Verify

Because the US has no legal definition for cold pressed, it can appear on any bottle. A refined olive oil — stripped of polyphenols through heat and chemical processing — could technically be labeled cold pressed in the US with no consequence. Most won't, because it would be obviously misleading, but the absence of regulation means the term carries no guarantee.

When the Temperature Was 27.1 Degrees

The EU threshold is a cliff, not a gradient. An oil malaxed at 28°C does not qualify for the cold extraction label — but it is also not dramatically different from one at 26°C. The 27°C threshold is a regulatory line that happens to sit near where polyphenol degradation becomes meaningful, but the relationship between temperature and quality is a curve, not a step. Some producers who can legally use the label ran their malaxers at 26.9°C. Others who cannot used 27.5°C. The regulatory line is not where polyphenol loss starts — it is where it becomes consistent enough to enforce. Staying well below 27°C, in the 22–25°C range, is where the meaningful quality difference lives.

When Other Process Variables Undermine It

Cold pressing is one variable. The temperature control during malaxation is important, but it doesn't override the others: how long after harvest the olives sat before pressing, whether the olives were damaged or overripe at the time of crushing, how long the oil has been stored, or whether it's been packaged in a way that protects it from light.

An oil that was cold pressed but stored in a clear glass bottle for 18 months before reaching the shelf has lost most of its polyphenols regardless of what the label says. And an oil cold pressed from olives that sat for five days after harvest started with depleted polyphenols before pressing even began. More on that: What Happens When Olives Sit Too Long Before Pressing.

Cold pressed is a necessary condition for high-quality oil. It is not a sufficient one. The full picture of olive oil fraud and mislabeling is covered here: Olive Oil Fraud: The Industry Problem and How to Protect Yourself.

What to Look for Instead

If cold pressed doesn't tell you enough on its own, what does?

•     How quickly the producer presses after harvest — this is the signal most labels hide. Most olive oils sit for days or even weeks before pressing, which means polyphenols are already degrading before extraction begins. Four Hour Olive Oil presses within four hours of picking. That gap — or lack of one — determines polyphenol levels before the oil ever enters the centrifuge.

•      Early harvest and low acidity — two signals that point to the same thing. Early harvest olives are picked before full ripeness, when polyphenol concentration is at its peak. Low acidity (below 0.8%) means the olives were healthy, handled carefully, and pressed quickly. Four Hour Olive Oil is both early harvest and low acidity — those are the markers of oil made correctly from the start.

•      Taste — the bitterness and pepper finish that indicate oleocanthal and hydroxytyrosol are present. If the oil is flat, buttery, or neutral, those compounds are gone regardless of what the label says.

•      Single-origin transparency — a named farm, estate, or region with a named olive variety. Blended oils from multiple countries offer less accountability and often reflect lower-quality sourcing.

For a full guide to what high-polyphenol olive oil means in practice: High-Polyphenol Olive Oil: Benefits, Taste, and Quality Explained. And for what the bitterness and pepper finish actually indicate: Why High-Polyphenol Olive Oil Tastes Bitter and Why That's Good.

 

At a Glance: Cold Pressed Explained What it means (EU/IOC) — Extraction temperature stayed at or below 27°C (80.6°F) throughout malaxation and centrifugal separation 'First cold pressing' vs 'cold extracted' — Same temperature threshold; the difference is traditional press vs. modern centrifuge. Not a quality distinction. In the US — No legal definition. The term can appear on any bottle without verification or enforcement. Why temperature matters — Above 27°C, polyphenols degrade, volatile aromas evaporate, and oxidation accelerates. The oil extracts faster but at lower quality. What it doesn't tell you — How long the olives sat before pressing, how the oil was stored, how fresh it is now, or what the actual polyphenol content is Better signals — Time from harvest to press (the shorter the better), published polyphenol content, bitterness/pepper taste, dark glass packaging, single-origin sourcing

 

Cold Extraction Is the Floor, Not the Ceiling Cold extraction below 27°C is the standard for quality EVOO — and it matters. But it only preserves what is already in the olive paste when pressing begins. Four Hour Olive Oil presses within four hours of harvest, at peak ripeness, before enzymatic degradation has a chance to reduce polyphenol levels. Cold extraction at that point locks in polyphenols that most oil never had to begin with. USDA Organic certified, single-origin, dark glass. Shop Ultra Premium →   |   Shop Premium →   |   Shop Duo →

 

Frequently Asked Questions

What does cold pressed mean on olive oil?

It means the oil was extracted at temperatures at or below 27°C (80.6°F) during the malaxation and centrifugal separation stages. The low temperature preserves polyphenols — the antioxidant compounds in olive oil — and volatile aromas that would otherwise degrade with heat. In the EU and under IOC standards, the label is regulated. In the US, there is no legal definition, so any producer can use it.

Is cold pressed olive oil better?

Genuinely cold pressed (or cold extracted) olive oil has higher polyphenol content and more complex aroma than oil extracted at higher temperatures from the same olives. But cold extraction is only one part of quality. Factors like how quickly olives were pressed after harvest, olive ripeness, and storage conditions also determine what ends up in the bottle. An oil labeled cold pressed is not automatically better than one that isn't.

What is the difference between cold pressed and cold extracted?

'Cold pressed' technically refers to traditional hydraulic press systems; 'cold extracted' refers to modern centrifugal systems. Both require temperatures below 27°C under EU rules. Almost all modern mills use centrifuges, so you will mostly see 'cold extracted' on bottles from regulated markets. The quality difference between the two methods, at the same temperature, is minimal. More important is what polyphenols actually are and what they do.

Is 'first cold pressing' better than cold extracted?

Not meaningfully. 'First cold pressing' sounds more artisanal and traditional — and it was, historically, when stone presses were used. Today it mostly describes the same centrifugal process with traditional-sounding language. Some bottles use it because consumers respond to it, not because the oil is made differently. Both require the same 27°C temperature limit in regulated markets.

Does cold pressed mean extra virgin?

No. Extra virgin and cold pressed describe different things. Extra virgin is a grade classification based on chemical measures (acidity, peroxide values) and sensory evaluation — it means the oil has no defects and meets specific quality thresholds. Cold pressed describes the extraction temperature. Most high-quality extra virgin olive oil is cold pressed, but the terms are not interchangeable. An oil can be cold pressed but still fail extra virgin grade if it oxidized quickly, and an extra virgin oil could theoretically be extracted warm if it still passes chemical and sensory tests.

Is cold pressed olive oil regulated in the US?

No. In the US, 'cold pressed' has no legal definition and is not regulated by any federal agency. The USDA has voluntary olive oil grade standards, but cold pressing is not one of the criteria. A producer can label any oil cold pressed without verification or enforcement. This is different from the EU, where the term is defined and regulated under specific labeling rules.

What temperature is cold pressed olive oil?

The regulated threshold is 27°C (80.6°F). This applies to the entire extraction process — malaxation (the kneading stage) and centrifugal separation. Many quality-focused producers run their malaxers even cooler, at 22 to 25°C, to further preserve polyphenol content. The trade-off is reduced oil yield: the cooler the extraction, the less oil comes out of the same weight of olives.

Does cold pressing preserve polyphenols?

Yes. Keeping extraction temperature at or below 27°C measurably preserves phenolic compounds compared to higher-temperature extraction. Research specifically comparing malaxation temperatures found significantly higher concentrations of key antioxidant compounds — including hydroxytyrosol and oleuropein derivatives — in oil extracted below 27°C. This is the main quality reason the temperature threshold exists.

What is malaxation in olive oil production?

Malaxation is the kneading or mixing of crushed olive paste before centrifugal separation. Lasting 20 to 45 minutes, it allows tiny oil droplets formed during crushing to merge into larger droplets that can be separated more efficiently. It is the most important stage for polyphenol preservation — temperature during malaxation directly affects how much of the oil's antioxidant compounds survive into the finished product.

What should I look for instead of 'cold pressed' on a label?

The most useful signals are: (1) how quickly the producer presses after harvest — the shorter that window, the higher the starting polyphenol level, (2) published polyphenol content in mg/kg, (3) bitterness and pepper finish when you taste it — those are signs that oleocanthal and hydroxytyrosol are present, and (4) single-origin sourcing with a named farm or region. For the full picture of what polyphenol levels mean: High-Polyphenol Olive Oil Explained.

Can refined olive oil be called cold pressed?

Technically no — refined olive oil goes through heat and chemical processing that would disqualify it. But in the US, where there is no enforcement, a producer could use the term on any oil. In regulated markets (EU, IOC member countries), refined oil cannot carry the cold pressed or cold extracted label. This is one more reason why US labeling requires more scrutiny than EU-regulated bottles.

Why does high-quality cold pressed olive oil taste bitter?

The bitterness and pepper sensation come from oleocanthal and other phenolic compounds that survive cold extraction. Oleocanthe — the compound responsible for the throat finish — is the same mechanism used by ibuprofen to reduce inflammation. It's a sign of high polyphenol content, not a defect. More on that: Why High-Polyphenol Olive Oil Tastes Bitter.

Does filtering affect cold pressed olive oil?

Filtering removes fine olive particles and water droplets from the oil. It doesn't affect polyphenol content significantly in the short term, but unfiltered oil can degrade faster during storage as the olive solids continue to break down in the bottle. The choice between filtered and unfiltered is largely about storage and preference, not cold pressing. See: Filtered vs. Unfiltered Olive Oil.

References and Sources

All studies are linked directly. Editorial framing is original to Four Hour Olive Oil.

 

[1] European Union Olive Oil Labelling Regulation — Article 5 on 'cold extracted' and 'first cold pressing' terms. View study [2] Sánchez-Ortiz A, et al. Influence of malaxation temperature on phenolic compound content in olive oil. Food Chemistry. 2020. View study [3] Caponio F, et al. Effects of low-temperature malaxation on phenolic content of extra virgin olive oil. Foods. 2021. View study [4] Olive Oil Times. What Does 'Cold Pressed' Really Mean? View study [5] American Oil Chemists Society. Olive Oil Overview. View study [6] International Olive Council. Trade Standard Applying to Olive Oils and Olive-Pomace Oils. View study

 

Note: This post discusses olive oil production methods and labeling regulations for educational purposes. Regulatory standards referenced are current as of publication date and may be updated. Consult official government and IOC sources for the most current labeling requirements in your market.

Affiliate/sponsored content disclosure: This post contains links to Four Hour Olive Oil products. We only recommend products we stand behind.