Cabernet Sauvignon vs. Merlot: How to Tell Them Apart in Blind Tasting

Cabernet Sauvignon and Merlot are two of the most planted red varieties in the world, and they are more closely related than most people realize. They grow in the same regions, they are blended together constantly, and their profiles can genuinely overlap. 

Let’s begin by talking about the one with the reuptation! Merlot has carried an unfair reputation for years, largely driven by word-of-mouth and media that shaped buying trends. The result is that a lot of people assume Merlot is simple or forgettable before they have ever seriously tasted it. Some of the most structured, complex, and age-worthy wines in the world are Merlot-dominant. 

The goal of this post is not to rank one above the other. It is to give you a repeatable tasting framework for separating them in blind tasting practice with structure as the primary lens and fruit and green notes as supporting evidence.

Why Cabernet Sauvignon and Merlot Get Confused

These to grapes are both Bordeaux blending grapes that share DNA …they are in the same family, grow in similar climates and soils, and are routinely blended together in some of the most famous wines in the world.

Because they complement each other so well, winemakers often use them in combination. Cabernet Sauvignon typically brings structure, tannin, dark fruit, and longevity. Merlot brings softness, roundness, and a bit more approachable fruit. Together they balance each other out.

The practical consequence for blind tasters is that the boundary between a Merlot-dominant blend and a Cabernet-dominant blend can be genuinely blurry! Great examples of both can share dark fruit, depth, and complexity. Regional style differences blur the picture further. A warm-climate Merlot from California can look and taste very different from a Right Bank Bordeaux Merlot, and both can be mistaken for Cabernet Sauvignon depending on the vintage and the producer.

Start with Structure, Not Tasting Notes

Structure is usually the most reliable differentiator. 

Here is what to focus on:

Tannin Level

Cabernet Sauvignon typically sits at medium-plus to high tannin. Merlot typically sits at medium to medium-plus. That slight gap is helpful, especially when you are tasting them side by side.

Tannin Quality

It is not just how much tannin there is, but what the tannin feels like. Cabernet Sauvignon tannins tend to be coarser and more gripping. They catch on the sides of the mouth and the gums. Merlot tannins tend to be rounder and more integrated. Descriptors like round, plush, velvety, and supple point toward Merlot. Descriptors like firm, grippy, muscular, or edgy point toward Cabernet Sauvignon.

Acid Level

Cabernet Sauvignon tends toward higher acid. Merlot tends toward medium. This can support your call.

Mouthfeel and Finish

The finish often tells you a lot here. Cabernet Sauvignon tends to leave with more grip and persistence. Merlot tends to finish softer and rounder. If the wine feels like it lingers with some edge, that points toward Cabernet. If it fades more smoothly, that points toward Merlot.

What Cabernet Sauvignon Usually Feels Like

When you taste a classic example of Cabernet Sauvignon, the first thing you tend to notice is the structure. It feels big. There is grip on the sides of the mouth. The tannins have texture to them.

Even ripe, fruit-forward styles are pretty ‘firm’. Napa Valley Cabernet Sauvignon can be very ripe and lush, but it usually still feels more structured than a Merlot at the same ripeness level. 

On the fruit side, Cabernet Sauvignon tends to lean dark fruit: blackcurrant, blackberry, black cherry. The fruit impression often feels concentrated and a bit more deep and powerful.

Green notes may or may not be obvious depending on the climate and ripeness level. In cooler climates or less ripe vintages, you might get clear bell pepper, jalapeño, or eucalyptus. In warmer climates or very ripe styles, those notes can fade significantly, which is where the confusion with Merlot can start.

What Merlot Usually Feels Like

Merlot tends to feel softer on the first sip. The tannins are rounder and more integrated. The mouthfeel is often described as smooth or plush. It does not grab the sides of the mouth the way Cabernet Sauvignon does.

That softness does not mean Merlot is simple though. Structured Merlot, especially from the Right Bank in Bordeaux, can be genuinely complex, age-worthy, and serious. What distinguishes it from Cabernet Sauvignon is not depth or quality but mostly texture.

Merlot’s fruit profile tends to sit in the more red fruit camp: Cherry, plum, and a softer, juicier fruit impression are common. There is often a quality to the fruit that feels a bit more approachable or a bit ‘sweeter’ even when the wine is dry. Dark fruit can appear in Merlot, but it usually feels less dominant than in Cabernet Sauvignon.

Green notes, when present, tend to be subtle. A fresh herbal quality rather than an intense bell pepper or jalapeño character. 

Fruit Differences That Help, But Do Not Decide the Call

Fruit can support your identification, but it should not be the deciding factor. Here is why.

Cabernet Sauvignon is commonly associated with blackcurrant, blackberry, and black cherry. Merlot is commonly associated with cherry, plum, and a softer, juicier fruit impression.

The problem is that fruit can mislead you in ripe styles. A very warm-climate Merlot can show plenty of dark fruit. A very ripe Cabernet Sauvignon can seem almost as soft and fruit-forward as a Merlot. If you are relying on fruit alone to make the call, you will get burned in some cases.

Think of fruit as a supporting clue. If the structure points toward Merlot and the fruit also points toward Merlot, that is a confident call. If the structure points toward Cabernet Sauvignon but the fruit seems softer and more red, hold your ground on the structure!

Pyrazines and Green Notes in the Comparison

Pyrazines are the aromatic compounds responsible for the green notes you sometimes find in Bordeaux varieties. Bell pepper, green pepper, jalapeño, eucalyptus, mint. They appear in higher concentrations in Cabernet Sauvignon than in Merlot, and that can be a useful signal in blind tasting.

In Cabernet Sauvignon, green notes can range from subtle to quite pronounced depending on climate and ripeness. Cooler climates and less ripe vintages tend to amplify them. Warmer climates and riper vintages tend to suppress them. When they are present, they point heavily to Cabernet Sauvignon.

In Merlot, intense green notes are uncommon. You might pick up a fresh herbal quality, something like dried herbs or a light vegetal note, but it rarely reaches the level of bell pepper or jalapeño. If you are getting clear, intense green character, that is a stronger signal for Cabernet Sauvignon.

The caveat is that very ripe Cabernet Sauvignon may show almost no green notes at all. In those cases, you cannot use the absence of green notes to rule out Cabernet. Go back to structure.

Why Ripe Cabernet and Structured Merlot Can Flip the Script

Very ripe Cabernet Sauvignon, especially from warmer regions, can be so fruit-forward and soft-seeming that it reads as Merlot. The green notes are gone. The fruit is lush. The tannins, while still present, are polished. In these situations, you may call Merlot and be wrong.

On the other side, Merlot grown at higher elevations or in cooler conditions can be surprisingly structured, with more dark fruit, higher tannin, and even some herbal character. Right Bank Bordeaux Merlot can be quite serious and restrained. Washington State Merlot can be dense and muscular. In those situations, you may call Cabernet Sauvignon and be wrong.

Region and climate matter. A wine’s structural profile is shaped by where it grew, not just what grape it is. That is why pattern recognition built through repeated exposure is more reliable than any single rule. The more examples you taste, the better your internal benchmarks become.

A Side-by-Side Practice Exercise

The fastest way to internalize this comparison is to taste these two varieties together. Here is a structured exercise worth adding to your practice tasting:

Round one: Napa Valley

Pick up a Napa Valley Cabernet Sauvignon and a Napa Valley Merlot at a similar price point. Taste them side by side without looking at the labels once you have poured.

Ask yourself: which one feels firmer? Which one has more grip on the sides of the mouth? Which one feels softer and rounder? Which one shows more dark fruit versus red fruit? Is there any green note in either, and if so, which one shows it more clearly?

Round two: Bordeaux

Grab a Left Bank Bordeaux, ideally from a Cabernet Sauvignon-dominant appellation like Margaux, and pair it with a Right Bank Bordeaux from Saint-Émilion or Pomerol, where Merlot typically dominates. 

The French examples will look and taste different from the California examples. The fruit will be more restrained, the profiles more earthy and herbal. But the structural differences between the two sides should still be legible if you are focused on tannin quality and finish.

For both rounds: taste out loud. Say what you notice as you notice it. Write a one-sentence conclusion for each wine before you check the labels.

Side-by-Side Practice Exercise Table (Fill-in)

Cabernet Sauvignon vs. Merlot at a Glance

How to Use This in Blind Tasting

When you sit down with an unknown red wine and you are considering whether it is Cabernet Sauvignon or Merlot, run through these questions in order.

First: what does the structure feel like? Is it firm and muscular, or softer and rounder? Tannin quality is your most reliable signal. 

Second: what fruit profile leads? Dark fruit dominant, or a mix of red and dark fruit with a softer impression? Let this support what the structure told you.

Third: are green notes present? Clear bell pepper or jalapeño points toward Cabernet Sauvignon. A light herbal quality or nothing at all is more consistent with Merlot.

Fourth: what does the finish tell you? Grip and persistence lean Cabernet. Softness and roundness lean Merlot.

Then make your call. Not a wild guess, but a deduction based on the evidence you’ve just tasted!

This isn’t memorizing a list of tasting notes and hoping the wine cooperates, but working through a consistent set of questions and letting the answers point you toward a conclusion!

Students preparing within the WSET system and those working toward tasting formats commonly used by the CMS will find this kind of deductive tasting approach directly relevant. These are skills that matter across major certification programs, and the Cabernet Sauvignon and Merlot comparison is a particularly useful exercise because the overlap between the two grapes forces you to rely on structure rather than obvious aromatic shortcuts.

If you want to build this kind of consistency in blind tasting through deliberate practice our Blind Tasting Group is a great step for you. It walks through the full tasting process with structured tastings designed to build pattern recognition across multiple varieties!

If you are newer to tasting and want to establish the foundational framework first, our Intro to Wine Tasting free course covers the basics of tasting with structure before you move into comparative work.

The most important thing, either way, is to keep tasting. Side by side. With intention. Writing down what you notice and checking your conclusions against the label! Have fun!