Rising temperatures are threatening the future of Napa Valley’s prized cabernet sauvignon, forcing winemakers to adapt to increasingly severe heat waves. Some vineyards are experimenting with heat-tolerant grape varieties to blend with cabernet, while others are investing in cooling technologies.
The shift poses significant risks for Napa’s multibillion-dollar wine industry. U.S. regulations require wines labeled as cabernet to contain at least 75% cabernet grapes, and blends typically command lower prices in the market. Studies show the average temperature during the crucial ripening period in Napa has warmed almost 3 degrees Fahrenheit (1.7C) from 1958 to 2016. Extreme heat can damage molecules that produce a wine’s color and aroma, potentially altering the renowned flavor profile of Napa cabernets.
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