Russian River Valley

Begins at Healdsberg where the Russian River turns west
Granted AVA status in 1983 and enlarged in 2005
Contains the sub-AVAs Chalk Hill and Sonoma Green Valley
Accounts for about one-sixth of the total planted vineyard acreage in Sonoma County
Has a characteristically cool climate, heavily affected by fog generated by the valley’s proximity to the Pacific Ocean
The fog is responsible for the large diurnal temperature variation with nighttime temperatures dropping as much as 35 to 40 degrees Fahrenheit (about 20 °C) from daytime high
The area is known for its success with cool climate varietals (Pinot noir and Chardonnay)
Volcanic vents deposited volcanic ash over layers of eroded bedrock and created sandstone of loam known as “Goldridge soil”
Some of the area’s most respected Pinot noir and Chardonnay vineyards are planted along deposits of Goldridge soil
Within the AVA there are several microclimates that allow for suitable plantings of Sauvignon Blanc, Gewürztraminer, Petite Sirah, Cabernet Franc, Syrah, Zinfandel and Merlot
In warmer areas of Chalk Hill there have been successful plantings of Cabernet Sauvignon