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Fire dispatchers received a call shortly after 2 p.m. reporting a fire on Quimby Road and two others on Mt. Hamilton Road.
At 3:22 p.m., the blaze was reported at 28 acres but had grown to 40 acres sometime before 4:15 p.m.
The fires were 50 percent contained by around 3:55 p.m., said Pam Temmermand, fire prevention specialist for Cal Fire.
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No structures have been threatened or lost and no injuries have been reported, Temmermand said. The cause and source of the fire is under investigation.