The CHP responded to a crash on Petaluma Boulevard South early Monday involving an overturned pickup, which had hit ice.
Initial reports indicated the Toyota Tacoma truck crashed at 7:44 a.m.
CHP reports said the pickup had hit some ice just before it rolled.
Earlier Monday a Volvo sedan crashed on Highway 1 near Stewarts Point-Skaggs Springs Road at about 6:45 a.m.
The sedan apparently had crashed into a fence and was partially blocking one lane of the coast highway.
The extent of any injuries to the driver wasn't initially available.
Monday's extremely cold morning temperatures resulted in patches of ice in some areas.