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High-altitude wines: Argentina and Georgia

Among the factors that shape wine, one is gaining particular attention today: altitude above sea level. The higher the vineyard lies, the more everything changes - from the intensity of the sun, through the differences in temperature, to the thickness of the grape skins. High-altitude wines are a category that fascinates connoisseurs with a freshness and intensity hard to achieve on the lowlands. Two countries are especially interesting here: Argentina, with vineyards climbing the Andes to dizzying heights, and Georgia, the cradle of wine spread across the slopes of the Caucasus. In this post you will learn how altitude shapes wine: the role of UV radiation, the diurnal range and the cool, and two fascinating countries of high-altitude winemaking. It is a journey to wines born close to the sky. Let us start with why altitude matters at all.

Why altitude matters

Altitude above sea level changes the conditions in which the vine grows in a deep and multidimensional way. Three factors are key. First, solar radiation, especially UV, increases with altitude - less atmosphere means more rays reaching the grapes. Second, the diurnal range, that is the difference in temperature between day and night, is much greater at altitude: hot days and cool nights. Third, the generally cooler climate at altitude balances even a southern, sunny location. These three factors together give wines of exceptional traits: intense colour, thicker skins, richer aromas, and at the same time preserved freshness and acidity. Altitude lets you grow vines in warm countries without the risk of the wines being heavy and overripe. That is why elevation has become one of the most important factors in modern winemaking. Altitude is not a detail, but the foundation of the character of high-altitude wine. So let us get to know each of these factors more closely, starting with the sun and UV.

UV radiation and thick skins

One of the most important effects of altitude is intense solar radiation, especially UV. UV radiation increases by about 10 percent for every 1000 metres of altitude, stimulating the grape skins to produce more anthocyanins, flavonols and tannins. At very high altitudes, as in the high-altitude vineyards of the Andes, the vine is exposed to intense sun, especially UV-B radiation, which gives the grapes more antioxidants and thicker skins. And thicker skins mean more colour, tannin and intensity of flavour. It is a natural defence mechanism of the plant: in response to UV stress the grapes produce more protective compounds, which translate into the richness of the wine. Therefore high-altitude wines often have a deep, intense colour and a clear tannic structure. What for the plant is a defence against radiation, for the wine becomes an asset. UV radiation is one of the secrets of the intensity of high-altitude wines. The higher, the thicker the skins and the richer the wine. It is a direct link between sun and flavour in the glass.

The diurnal range and freshness

The second key effect of altitude is a large diurnal range, that is the difference in temperature between the warmest part of the day and the cool of the night. Altitude greatly amplifies this difference. In the high-altitude vineyards of Mendoza the diurnal range can reach as much as 15 degrees Celsius during the growing season. This phenomenon is extremely valuable for wine. Hot days let the grapes ripen and accumulate sugars and aromas, and cool nights slow the respiration of the plant, preserving the acidity and freshness. The result is wines that combine the ripeness of the fruit with crisp, refreshing acidity. A high diurnal range at altitude preserves acidity and aromatic freshness even in otherwise warm climates. That is why high-altitude wines from hot countries are not heavy, but energetic and fresh. The diurnal range is the secret of the balance of high-altitude wines: fullness of fruit without loss of tension. It is a combination hard to achieve on the lowlands. Mountain freshness, as producers call it, is the calling card of these wines.

Argentina - vineyards in the Andes

Argentina is the most famous country of high-altitude winemaking, with vineyards climbing the slopes of the Andes to dizzying heights. Most of the vineyards of the Mendoza region lie at an altitude of 600 to 1100 metres above sea level, but that is only the beginning. In the Salta region, in the north of the country, the Altura Máxima vineyard belonging to Bodega Colomé lies at about 3111 metres, which makes it one of the highest-altitude commercial wine operations in the world. These extreme altitudes give wines of remarkable intensity. The flagship grape of Argentina is Malbec, which at altitude reaches its peak: deep colour, ripe fruit and structure, and at the same time freshness. Characteristic of Salta too is the white Torrontés, aromatic and floral. The wines from the high-altitude vineyards of Salta show an intensity of colour, aroma and phenolic structure that producers at lower altitudes in the same country cannot easily replicate. Argentina is proof of how altitude can lift wine to a new level. We write more about this grape in our post on Malbec from Cahors and Argentina.

Georgia - vineyards of the Caucasus

Georgia is a completely different, but equally fascinating example of high-altitude winemaking. This Caucasian country is considered the cradle of wine, with a tradition reaching back thousands of years. The vineyards of Georgia are spread across the slopes and valleys of the Caucasus, mountains that give them altitude, cool and varied microclimates. Georgian winemaking combines high-altitude terroir with unique, ancient methods, like fermentation in clay amphorae buried in the ground, called qvevri. Georgia is famed for the huge diversity of indigenous grapes, of which there are hundreds, and many of them grow at altitude, benefiting from the mountain climate. The altitude of the Caucasus gives Georgian wines freshness, structure and character, combining ancient tradition with the natural advantages of terroir. It is a country where high-altitude winemaking meets the oldest wine history in the world. Georgia shows that altitude shaped wines long before anyone called it that. We write more about the Georgian tradition in our post on Georgian qvevri wines.

The character of high-altitude wines

High-altitude wines, regardless of country, have certain common traits resulting from elevation. First, intense, deep colour, being the effect of thicker skins rich in anthocyanins. Second, a clear tannic and phenolic structure, giving the wines strength and ageing potential. Third, and perhaps most importantly, freshness and crisp acidity, preserved thanks to the cool nights despite the intense sun. Fourth, intense, concentrated aromas, being the effect of the concentration of compounds in smaller, thicker berries. This combination of power and freshness is the hallmark of high-altitude wines. They are not heavy and overripe wines, as they could be from a hot climate on the lowlands, but energetic, intense and at the same time taut. It is precisely this balance that makes them so prized. The character of high-altitude wines is a direct reflection of the extreme conditions in which they are made. They are wines full of contrast: ripeness of fruit and mountain freshness in one glass. It is the taste of altitude.

The challenges of growing at altitude

Growing vines at high altitudes is not only advantages, but also serious challenges. First, the risk of frosts: at altitude the nights are sometimes very cold, and spring and autumn frosts can destroy the crop. Second, intense UV radiation, although beneficial for the skins, can also cause sunburn of the grapes if they are not properly shaded by leaves. Third, difficult terrain: steep mountain slopes hinder cultivation and harvest, often requiring manual work. Fourth, lower pressure and extreme conditions stress the plant, giving low yields, although of concentrated flavour. Fifth, access to water is sometimes a challenge in dry, high-altitude areas. These difficulties mean that high-altitude winemaking requires knowledge, experience and hard work. What gives the wines their exceptional character at the same time makes their production difficult. Low yields and extreme conditions are the price paid for intensity and freshness. High-altitude wines are thus the fruit not only of nature, but also of human effort.

High-altitude wine in a table

Let us set out how altitude affects wine:

The table shows how altitude shapes wine. More UV radiation gives thicker skins, intense colour and tannins. A large diurnal range preserves freshness and acidity. A cooler climate balances even a southern location. And stress and low yields concentrate the flavour. Together these factors give wines that are full, intense and at the same time fresh. It is proof that altitude is a powerful tool shaping the character of wine, used masterfully in Argentina and Georgia.

Why it is worth getting to know high-altitude wines

Getting to know high-altitude wines is a fascinating adventure for every wine lover. First, they offer a unique combination of intensity and freshness, hard to find elsewhere - the power of fruit with mountain crispness. Second, they show how huge an influence altitude has on wine, one of the most important factors of modern winemaking. Third, Argentina and Georgia are two completely different, but equally fascinating worlds: the modern, extreme Andes and the ancient, traditional Caucasus. Fourth, many of these wines offer an excellent quality-to-price ratio. Fifth, the landscapes of high-altitude vineyards are simply breathtaking. Instead of reaching again and again for wines from classic, lowland regions, it is worth trying a wine born close to the sky and seeing how altitude tastes. It is a journey that rewards curiosity with intensity, freshness and a unique character. High-altitude wines are one of the most exciting trends of the modern world of wine.

The key points in a nutshell

High-altitude wines are made where altitude changes the conditions of cultivation. More UV radiation (increasing by about 10 percent per 1000 metres) stimulates thicker skins rich in anthocyanins and tannins, giving intense colour and structure. A large diurnal range, reaching as much as 15 degrees, preserves freshness and acidity despite the heat. Argentina is the most famous country of high-altitude winemaking, with vineyards in the Andes to over 3000 metres (Salta, Mendoza), where Malbec reaches its peak. Georgia, the cradle of wine, combines the high-altitude terroir of the Caucasus with the qvevri tradition. Growing at altitude is difficult (frosts, UV, terrain), but gives wines full and fresh at once. Want to get to know high-altitude wines and record your impressions? Keep tasting notes in the GustoNote app. See also our posts on Malbec and on Georgian qvevri wines.