SONOMA COUNTY — October 26, 2026. Drivers using State Route 128 to cross wine-country and rural corridors between Sonoma and Napa counties face a long-running roadwork restriction. The current Caltrans conditions bulletin describes alternating one-way traffic at various locations between approximately 8.2 and 9 miles west of the Sonoma/Napa county boundary.

The scheduled control applies 24 hours a day, seven days a week and is currently listed through 7 p.m. June 30, 2027. The state does not publish a numerical delay estimate for this segment in the bulletin, so a specific waiting time should not be invented.

What the location does—and does not—tell drivers

The notice identifies a precise section of SR-128 on the Sonoma side of the county line, rather than a complete closure from the coast to the Napa Valley. Residents traveling between vineyards, workplaces and regional medical appointments may need to allow extra time, particularly when encountering temporary signals or alternating traffic.

A planned roadwork expiration in 2027 is not proof that the restriction will remain unchanged every day until then. Conditions and traffic controls can be revised at any time; drivers should follow posted instructions in the field.

Source: Caltrans SR-128 traffic bulletin, checked October 26, 2026. Use QuickMap to check live conditions. This article belongs to Sonoma County because the source does not identify a narrower town location with certainty.

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