The Covelo AVA is an American Viticultural Area located in northern Mendocino County, California. Although the region only has 12 acre under vine, it was granted AVA status by the United States Department of the Treasury Alcohol and Tobacco Tax and Trade Bureau on February 16, 2006, based purely on the unique climate conditions of the area. Jake Claus and William Claus planted the only (CCOF) Vineyards in the Covelo AVA, making them the monopoly of grape Farms/Growers in the AVA. The appellation is located 45 mi north of Ukiah, California, and includes the areas of Round and Williams Valleys. The area is relatively flat terrain built upon deep loam soil layers, the valley floor sits at 1230ft elevation. Unlike other areas in the California wine country, Covelo has a continental climate with the high peaks surrounding the valley shielding it from the influence of the Pacific Ocean. The growing season here is one of the shortest in Mendocino County and the area experiences one of the widest diurnal temperature variation in the region.