The Spring Mountain District gained AVA status in 1993, and is a sub-appellation of the Napa Valley AVA. Located on 8,600 acres, the appellation sits on steep terraces of the Mayacamas Mountains that separate Napa Valley from Sonoma Valley. Elevations on the mountain range from 400 feet to 2,600 feet above sea level. The region contains mostly residual upland soils with only a few areas of alluvial soils at the lower elevations. The soils are derived almost equally from sandstone and Sonoma volcanic formations which are predominately composed of Andesite. This mix of sedimentary and volcanic rocky soils distinguishes the region from adjacent mountain areas. Spring Mountain is the coldest appellation in the Napa Valley. In the height of growing season, strong cold winds and low lying fog permeates the region. The vast majority of the wine produced in the Spring Mountain District is Cabernet Sauvignon, Cabernet Franc, Merlot, and Zinfandel.
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