The California Shenandoah Valley is the oldest growing region in the broader Sierra Foothills Appellation. It is the most western and lowest elevation of its sister appellations, and warm climate varietals benefit from substantial summer heat. The hilly terrain and poor water holding capacity produce wines of richness and structure. The soil profile for much of the valley is decomposed granite derived from the Sierra Nevada mountain range, as well as sandy loam. The high iron content gives the soil a rusted color.