In Sonoma County, residents of the Oakmont Gardens senior living facility in Santa Rosa boarded brightly lit city buses in the darkness overnight, some wearing bathrobes and using walkers.
More than 1,200 people were also evacuated in Shasta County for the Zogg Fire, spread over 23 square miles (59 square kilometers) by Monday.
So far in this year's historic fire season, more than 8,100 California wildfires have now killed 29 people, scorched 5,780 square miles (14,970 square kilometers), and destroyed more than 7,000 buildings.
Fire worries were developing across Southern California, although it was unclear how strong the predicted Santa Ana winds would become.
Conditions were also hot, dry and windy in parts of Arizona, where the Sears Fire in Tonto National Forest north of Phoenix has grown to more than 14 square miles (36 square kilometers) since it erupted Friday.