Jericho Canyon is a rugged area at the northeast end of the Napa Valley in the Mt. St. Helena foothills. It benefits from very hot summer days moderated by cool nights and chilly mornings. These favorable conditions are caused by a break in the Mayacamas Range which allows the coastal fog to reach our end of the valley. The soils are a volcanic Boomer clay loam and gravelly loam, which provide excellent drainage while reducing the yields.