The Guenoc Valley AVA is in Lake County, California, north of the town of Calistoga. The AVA sits on 23,000 acres, and its grapes are grown at an elevation of 400 ft. It is name for the Mexican Land Grant, Rancho Guenoc that was given to George Rock in 1845. Viticulture began in the valley in 1887 when Lily Langtry, mistress of the future Edward VII purchased part of the original Rancho to raise racehorses and make wine.
The Guenoc Valley is small and comprised of a mix of Arroyo Seco and Conejo Loam soils deposited by former rivers to make the region one large alluvial fan. The Guenoc Valley is isolated from surrounding areas by rocky ridges, creating a small valley. Compared to surrounding areas, the Guenoc Valley receives less rainfall per year, but greater temperature variance throughout the year. The region is known for its Syrah production, but also produces Petit Verdot, Malbec, Semillon, Chardonnay, and Sauvignon Blanc.
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