Argentina's most exciting wine sub-region within Mendoza, at 1000-1500m altitude in the shadow of the Andes. Gualtallary, Altamira, and Los Chacayes sub-zones produce Malbec and white varieties of extraordinary refinement — higher acidity, more defined structure, and longer aging potential than the valley floor.
| Year | Rating | Notes |
|---|---|---|
| 2022 | — | The finest Uco Valley vintage in the modern era; Gualtallary Malbec of extraordinary mineral precision and Chardonnay of Burgundian elegance. |
| 2021 | — | Outstanding vintage; Altamira and Los Chacayes produced Malbec of rare freshness and structural definition. |
| 2020 | — | Excellent conditions; old-vine Malbec at altitude showed exceptional complexity and aging potential. |
| 2019 | — | Benchmark Uco Valley vintage; Zuccardi Jose Zuccardi from this year considered among Argentina's greatest. |
| 2018 | — | Solid vintage; the limestone sub-zones consistently produced more refined Malbec than the valley floor. |