The blaze was reported around 5:45 p.m. near Berryessa Knoxville Road at Spanish Flat Loop Road, Cal Fire reported.
Firefighters reportedly had the flames contained by about 7:30 p.m.
At least two structures were threatened by the flames, which burned mainly grass and brush and did not damage any structures, according to Cal Fire.
No injuries were reported.
No evacuations have been ordered at this time.
Stay with ABC7NEWS.COM for more on this developing story.
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MAP: Google Reference Map of California Fires
(From the Governor's Office of Emergency Services).