California State Route 121

State Route 121
State Route 121
	Map of western California with SR 121 highlighted in red
Route information
	Maintained by Caltrans
Length	33.567 mi (54.021 km)
Major junctions
South end	SR 37 at Sears Point
	SR 12 from Schellville to Napa; SR 29 in Napa;
North end	SR 128 near Lake Berryessa
Location
Country	United States
State	California
Counties	Sonoma, Napa
Highway system
	State highways in California; Interstate; US; State; Scenic; History; Pre‑1964; Unconstructed; Deleted; Freeways;

State Route 121 (SR 121) is a state highway in the U.S. state of California. It runs through the Wine Country region of Sonoma and Napa counties. Its southern terminus is at State Route 37 at Sears Point, and its northern terminus is at State Route 128 near Lake Berryessa. SR 121 passes through the Carneros region of the southern Sonoma Valley and Napa Valley.

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