Chile for WSET: a country organised by cooling

Chile looks daunting on a map, a country some 4,000 kilometres long, but it is one of the most systematic regions on the syllabus. Almost everything examinable follows from a single question: where does the cooling come from. This is an orientation; the regional drill belongs in your course materials and our app.

What WSET asks you to know

At Level 2, recognition: a warm, largely Mediterranean climate producing ripe, fruit-forward and reliably good-value wines, with Cabernet Sauvignon, Merlot, Carmenère, Chardonnay and Sauvignon Blanc as the principal varieties.

At Level 3, you are expected to explain the moderating influences in detail, place the main valleys, and account for the stylistic difference between a coastal and an Andean wine from the same latitude.

The framework

Three ideas carry most of the marks:

• Four cooling influences, not one. The Humboldt current runs cold water up the coast and pushes morning fog inland, cooling anywhere the Coastal Range lets it through. The Andes send cold air down the valleys at night, creating a wide diurnal range that preserves acidity. The Coastal Range itself blocks maritime influence, which is why the Central Valley behind it is warmer and drier. Latitude adds the fourth axis, from the desert north to the cool, wetter south.
• A grid, not a line. Chile traditionally reads north to south, but the classification introduced in the 2010s added an east to west layer: Costa for coastal sites, Andes for foothill sites, and Entre Cordilleras for the warmer land between the two ranges. A wine labelled Costa and one labelled Andes can share a valley name and taste quite different, which is exactly the point examiners test.
• Carmenère is the identity grape. A Bordeaux variety that all but vanished in France, it was widely mistaken for Merlot in Chilean vineyards until it was correctly identified in the 1990s. It ripens later than Merlot, and picked too early it shows pronounced green pepper character, so ripeness management is the whole story with it.

Running north to south, the valleys worth holding are Elquí and Limarí in the far north, then Aconcagua with the cool coastal Casablanca and San Antonio valleys, then the Central Valley containing Maipo, Rapel with its Cachapoal and Colchagua sub-zones, Curicó and Maule, and finally Itata and Bío Bío in the south. Maipo is the classic address for Cabernet Sauvignon, Casablanca and San Antonio for Sauvignon Blanc and Chardonnay, and the southern valleys for old-vine País and a cooler, leaner style.

One further point often appears as a short factual question: Chile has never suffered a phylloxera epidemic, so many vines are grown on their own roots rather than grafted.

How Chile shows up in tasting

A Maipo Cabernet Sauvignon reads deep ruby, ripe blackcurrant and black cherry, a mint or eucalyptus lift that is often cited as a regional marker, medium-plus tannin and clear oak. A Casablanca Sauvignon Blanc reads pale lemon with high acidity, grapefruit and green apple, more restrained than a New Zealand example. Carmenère sits between the two in weight, with dark fruit, soy and a herbaceous, green peppercorn note when not fully ripe. For the wider climate vocabulary, see climate types for WSET.

What to do next

Chile is best learned against its varieties rather than in isolation, so read it with Cabernet Sauvignon, Merlot and Sauvignon Blanc, then place it beside the other New World countries on the syllabus.

FAQ

What cools Chilean vineyards? The cold Humboldt current and its fog from the west, cold air descending from the Andes at night, and increasing latitude towards the south.

What are Costa, Entre Cordilleras and Andes? Designations added in the 2010s that classify a site east to west: coastal, between the ranges, and Andean foothills.

Why was Carmenère confused with Merlot? The two were interplanted and look similar in the vineyard. Carmenère was correctly identified in Chile in the 1990s and is now treated as the country's signature red.

Which valley is best known for Cabernet Sauvignon? Maipo, in the Central Valley, often showing a characteristic mint or eucalyptus note.

Is Chile phylloxera free? Chile has never had a phylloxera epidemic, so a large proportion of its vines are ungrafted.