It is defined by its sandy Gold Ridge loam and an almost daily intrusion of fog.
Nights are cool.
The pinot noir grape and the Gravenstein apple are the acknowledged stars of Green Valley, though scores of other agricultural products flourish in the mild climate. This is where the spring apple blossoms drape the hillsides like unfurled bolts of lace, and the late summer light bathes the hillside orchards and vineyards in gold. Country roads curve through flower farms and market gardens, and wind up hills toward spectacular views of Mount St. Helena. From the highest points, you can see the Pacific Ocean, and watch the fog creep inland. Forestville, Graton, and northern Sebastopol are within Green Valley's border, which was established in 1983 largely through the efforts of Barry Sterling of Iron Horse Vineyards.