How many microclimates are in Sonoma County?

Instead, the county comprises 19 microclimates, with diverse soils, topography, and weather, all of which affect the terroir, or wine-growing environment. Sonoma County is a study in geography and topography, which determines what types of grapes can be successfully grown in each microclimate.



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During an average summer there are many days when fog maintains a band of cold air all along the coastline and cold breezes blow a fog bank in through the Petaluma gap northward toward Santa Rosa, and northwestward toward Sebastopol. It also moves around Sonoma Mountain, not quite reaching Glen Ellen.

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