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Columbia Valley AVA

Established 1984 Washington's largest viticultural region, covering almost 11 million acres (4,451,700 hectares) which represents a full third of Washington State's land mass. The Columbia Valley contains 99% of wine grapes grown in Washington State - 40,050 acres (16,207 hectares). 6,851 vineyard acres (2,772.7 hectares) of wine grapes are planted in the Columbia Valley AVA and not included in any other sub-AVAs in Washington. Columbia Valley's vast size allows for a number of meso- and micro-climates. Vineyards are planted on predominately south-facing slopes, increasing solar radiation in summer and promoting air drainage in winter. Riesling, Merlot, Chardonnay and Cabernet Sauvignon are the most widely planted varietals. Growing season of 180-200 days with annual rainfall averaging 6 to 8 inches (15-20 cm). The Columbia Valley contains the American Viticultural Regions of Red Mountain, Yakima and Walla Walla Valleys, Wahluke Slope, Rattlesnake Hills, Horse Heaven Hills, Snipes Mountain, Lake Chelan, Naches Heights and Ancient Lakes within its borders.