Lake County California Lake County is located just north of the world-reknowned winegrowing regions in Napa and Sonoma counties. Not surprisingly, good vintages are also grown here. Vineyards & Wineries: Eagle's Domain Winery Greg Norman Estates Guenoc Jed Steele's Shooting Star Langtry Estate & Vineyards Lolonis Winery Mountain View Vintners Rosenblum Cellars 75 AVAs within the County: Benmore Valley Clear Lake Guenoc Valley High Valley Red Hills