Chile's Three Transversal Designations: Costa, Entre Cordilleras & Andes

Chile's modern wine classification began with Decree 464, issued in 1994 and in effect from 1995, which organized the country's wine regions by north-to-south river valleys. That system defined geographic boundaries and labeling requirements but imposed no restrictions on grape varieties or yields. As the industry evolved, producers and educators recognized that the traditional valley-based system could not express the enormous climatic differences running east to west across Chile's narrow width. In mid-2011, the Ministry of Agriculture amended Decree 464 to introduce the three transversal designations, Costa, Entre Cordilleras, and Andes, as an optional overlay to the existing DO framework. The move drew broad praise for its ambition but also criticism from observers like MW Peter Richards, who noted that geographic boundaries did not always align neatly with actual climatic conditions on the ground.

• 1994: Decree 464 issued, establishing Chile's DO system organized by river valleys from north to south
• 1995: The DO framework officially came into effect, defining regional boundaries and labeling rules with no variety or yield restrictions
• 2011: Ministry of Agriculture amended Decree 464 to introduce Costa, Entre Cordilleras, and Andes as voluntary, complementary climate designations
• 2018: Four new sub-regional DOs formally recognized: Apalta, Los Lingues, Lo Abarca, and Licantén

Chile is a long, narrow country with the Pacific Ocean to the west and the Andes Mountains to the east, never more than around 180 kilometers wide. The three transversal designations map onto this east-west axis. The Costa zone is shaped by the icy Humboldt Current, which chills the Pacific and generates a dense morning fog Chileans call camanchaca; this blankets coastal vineyards, keeping temperatures low and extending the ripening period, defining the character of cool-climate whites and Pinot Noir. The Entre Cordilleras zone covers the warm central valley between the Coastal Range and the Andes, where the majority of Chilean wine has historically been produced. The Andes zone sits in the eastern foothills, where the Andes generate dramatic diurnal temperature shifts: as the sun drops each evening, cold air slides down the mountainsides, dropping nighttime temperatures dramatically and preserving natural acidity in the grapes. Within large DOs such as Colchagua and Aconcagua, all three climatic designations can exist simultaneously.

• Costa: Pacific-facing zones cooled by the Humboldt Current and camanchaca morning fog; includes coastal zones of Limari, Casablanca, San Antonio, Colchagua, and Itata
• Entre Cordilleras: The warm central valley floor between the Coastal Range and the Andes, responsible for approximately 60% of Chile's wine production
• Andes: Eastern Andean foothills where dramatic diurnal temperature swings preserve acidity and build phenolic structure; covers high zones in Elqui, Choapa, Maipo, Cachapoal, Curico, and Maule
• Chile has roughly 130,000 hectares under vine, stretching across 1,300 kilometers of Pacific coastline, with all three designations applied from Elqui Valley in the north to Malleco Valley in the south

The Costa designation has become closely associated with cool-climate varieties that thrive under Pacific maritime influence. Casablanca and San Antonio produce some of Chile's most acclaimed Sauvignon Blanc, Chardonnay, and Pinot Noir, with high natural acidity and mineral intensity. Matetic Vineyards, based in the Rosario sub-valley of San Antonio, pioneered cool-climate Syrah in this zone with the 2001 EQ Syrah, Chile's first cool-climate Syrah. Entre Cordilleras is the historic heartland of Chilean viticulture, dominated by Cabernet Sauvignon and the country's signature grape, Carmenere; the Cachapoal sub-zone around Peumo has become particularly celebrated for Carmenere expression. The Andes designation rewards varieties that benefit from high diurnal temperature variation: Cabernet Sauvignon in Maipo's upper foothills, Carmenere in the Colchagua Andes zone of Los Lingues, and emerging expressions of Syrah and Malbec at altitude.

• Costa: Sauvignon Blanc, Chardonnay, and Pinot Noir excel in Pacific-cooled zones; cool-climate Syrah is a notable specialty in San Antonio and Aconcagua Costa
• Entre Cordilleras: The core of Cabernet Sauvignon and Carmenere production; Cachapoal around Peumo and Colchagua's Apalta DO (1,007 ha, Entre Cordilleras) are benchmark zones
• Andes: Cabernet Sauvignon, Carmenere, Malbec, and Syrah benefit from high diurnal variation and Andean influence; Los Lingues DO in Colchagua Andes is a notable example
• Within a single major DO such as Aconcagua or Colchagua, all three designations may be applied to different vineyards, demonstrating how dramatically the east-west axis shapes wine style

Matetic Vineyards, situated in the Rosario Valley of San Antonio (Costa), is certified organic and biodynamic across 160 hectares and produces the EQ range, with the EQ Cool Climate Syrah serving as a defining benchmark for Chile's cool Pacific coast. Errazuriz has planted over 230 hectares in Aconcagua Costa, producing Pinot Noir, Chardonnay, and Syrah from vineyards less than 15 kilometers from the Pacific. In the Entre Cordilleras zone, Concha y Toro's Don Melchor is one of Chile's most celebrated Cabernet Sauvignons, sourced from Puente Alto in Maipo. Seña, initially a joint venture between Eduardo Chadwick and Robert Mondavi and now owned entirely by the Chadwick family since 2005, is a Bordeaux-style blend from the Aconcagua Valley classified as Entre Cordilleras, with vineyards on the eastern side of the Ocoa coastal range. In the Andes zone, Koyle Family Winery farms 80 hectares in the Los Lingues DO of Colchagua Andes, and Lapostolle, Montes, and Neyen are leading voices in Apalta (Entre Cordilleras).

• Costa: Matetic Vineyards (Rosario Valley, San Antonio) with EQ Syrah and Sauvignon Blanc; Errazuriz with extensive Aconcagua Costa plantings
• Entre Cordilleras: Concha y Toro Don Melchor Cabernet Sauvignon (Puente Alto, Maipo); Seña Bordeaux-style blend (Aconcagua Valley); Lapostolle, Montes, and Neyen in the Apalta DO
• Andes: Koyle Family Winery in Los Lingues DO (Colchagua Andes); Siegel and Casa Silva also produce from the Los Lingues zone
• The Apalta DO (1,007 ha, Entre Cordilleras, Colchagua) and Los Lingues DO (492 ha, Andes, Colchagua) illustrate how the designations operate within a single broader valley

The three climate designations are not an integral part of Chile's Denomination of Origin system; they provide additional, complementary information that producers may choose to use. When a producer opts to include a designation, at least 85% of the grapes must originate from the corresponding geographic zone (for wines destined for export; 75% applies to domestic sales). Both the climatic designation and the traditional DO may appear on the label simultaneously, for example 'Colchagua Entre Cordilleras' or 'Aconcagua Costa.' The system is considerably more flexible than European protected designation of origin frameworks: there are no restrictions on grape varieties, yields, or viticultural methods within any Chilean DO. Critics noted some boundary anomalies at launch, such as parts of Limari being divided between Costa and Entre Cordilleras in ways that did not reflect the actual climate-driven wine styles being produced.

• The designations are voluntary and complementary; the official brochure at launch stated they are 'not an integral part of Chile's Denomination of Origin system'
• Labeling rule: at least 85% of grapes must originate from the named climatic zone for export wines (75% for domestic)
• Dual labeling is permitted: the climatic designation and the traditional DO valley name can appear together on the same label
• Unlike European PDO systems, Chilean law imposes no restrictions on grape varieties, yields, or viticultural practices within any DO or climatic designation

The three designations offer a practical framework for wine tourism, giving visitors a way to plan itineraries around climatic character rather than administrative geography alone. The Costa wine route centers on Casablanca Valley, around 90 minutes from Santiago by road, and the San Antonio Valley further west. Matetic Vineyards in the Rosario sub-valley of San Antonio, located between 9 and 19 kilometers from the Pacific Ocean, offers vineyard visits on its biodynamically farmed estate. Entre Cordilleras tourism is anchored in the Maipo, Rapel, and Colchagua valleys, where historic producers such as Concha y Toro have operated since the nineteenth century; the Apalta valley in Colchagua, now a legally recognized DO, draws visitors to Lapostolle and Montes. Andes-focused visits take travelers into the eastern foothills of valleys like Maipo and the Colchagua Andes zone, where the altitude and diurnal variation that define the designation can be experienced directly through comparative tastings.

• Costa route: Casablanca Valley (approximately 90 minutes from Santiago) and San Antonio Valley; emphasis on maritime influence, Sauvignon Blanc, Pinot Noir, and cool-climate Syrah
• Entre Cordilleras circuit: Maipo, Rapel (Cachapoal and Colchagua), Curico, and Maule historic estates; Carmenere and Cabernet Sauvignon focal points
• Andes experience: Upper Maipo foothills and Colchagua Andes zones such as Los Lingues DO; elevation and diurnal variation are the defining terroir stories
• Best season: March through May (harvest and early autumn) allows visitors to observe all three climatic zones during vintage, when the differences in ripening rhythm are most visible