Dunn Vineyards:

"Randy and his fellow, neighboring vintners defined the Howell Mountain AVA in 1983, above the fog line at 1,400 feet, where overall cooler temperatures but more hours of sunlight foster vines with smaller, thicker-skinned berries and yield wines of abundant structure. All of Dunn’s vineyards sit between 1,850 and 2,100 feet of elevation with primarily eastern exposures, reducing the risk of frost. With yields averaging fifty percent of the valley floor’s, Howell Mountain has definitively low vigor due to its meager, shallow soil."