"We have spoken to the Vacaville police and asked them to increase patrols in the area," Becky Weiss, assistant manager of Brenden Theaters on Davis Street in Vacaville, told the Vallejo Times-Herald newspaper.
"Officers will be walking through the lobby every couple of hours or so," she said.
Weiss also said Brenden Theaters had added security guards for the debut showing of "The Dark Knight Rises," which is playing on several screens at the 16-theater multiplex.
Security was increased at venues nationwide following the mass shooting at an Aurora, Colo. theater during the film's debut showing.
Twelve died and dozens were wounded in the attack, allegedly perpetrated by a heavily armed 24-year-old University of Colorado graduate student.
Vallejo police announced increased drive-by and lobby checks at the Century 14 multiplex at 109 Plaza Drive.
Vallejo police planned drive-by checks around the theater and lobby Friday, "if time allows," Lt. Lee Horton said.
"I don't think we'll have any problems," Lt. Lee Horton told the newspaper.
"But we're prepared if something like that happens."
The theater's assistant manager, Atta Areqat, told the newspaper that additional security precautions had been taken to protect theatergoers, just in case.
"We're taking precautionary measures," he said.