State Route 121 (California)
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Map of western California with SR 121 highlighted in red
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| Route information | ||||
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| Maintained by Caltrans | ||||
| Length: | 33.57 mi (54.02 km) | |||
| Major junctions | ||||
| South end: |
 SR 37 at Sears Point
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| North end: |
 SR 128 near Lake Berryessa
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| Location | ||||
| Counties: | Sonoma, Napa | |||
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State Route 121 (SR 121) is a California state highway in the Wine Country that runs northerly from its junction with State Route 37 at Sears Point, past the Tolay Lake basin and across Tolay Creek near Infineon Raceway, veers east at a junction with State Route 116 and Bonneau Road at Schellville, runs eastward through the Carneros region of the southern Sonoma Valley and Napa Valley (concurrent first with State Route 12, then with State Route 29), then northeastward to end near Lake Berryessa in Napa County.
The route begins at SR 37 in Sears Point. As it continues northward through Sonoma County, it meets SR 116. It then enters Schellville, where it begins a short overlap with SR 12. Upon leaving, it begins another overlap with SR 29, which happens to be a freeway, in Napa County. When it leaves, it continues northward and meets SR 221 in Napa. As it leaves the city, it continues northward for several miles before reaching its north end at SR 128.
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