According to Jimmy Lee, spokesman for the Contra Costa County Sheriff's Office, the student told teachers that around 8 a.m., a man in a van drove into the school's drop-off zone, located at 5150 Live Oak Ave. in Oakley, and offered to give her a ride.
Lee said the girl refused the offer, and the van drove away. The 9-year-old immediately reported her encounter to staff, who then called the Oakley police.
"She was fabulous," said Principal Didi Del Chiaro. "She kept the conversation very short, she refused his offer and came right to the office. If you think through the eyes of a parent, it is the response you hope your child would give."
Officers searched the area but were not able to find the van.
The student described the driver as an African-American male in his 30s with long braids or dreadlocks and green eyes. He was wearing a white 49ers baseball cap, a blue and white scarf, a green jacket and black pants, Lee added.
The vehicle he was driving was described as an older, blue van.
Del Chiaro said Oakley police will increase their presence in the area and that parents have also said they will be on alert.
"This was concerning in the sense that one of my kids was approached by someone who shouldn't have been at the school," Del Chiaro said. "But no one was injured. The student was stellar."
Anyone with any information on the incident is ask to contact the Oakley Police Department at 925-625-8855.
Follow Katie Nelson at Twitter.com/katienelson210.