The incident was reported at 2:45 p.m. Wednesday in the vicinity of Tesla and Corral Hollow Roads, between Tracy and Livermore in unincorporated Alameda County.
VIDEO: Fast-moving fire burns 2,500-acres east of Livermore
At this point in the operation crews are mopping up, putting out hot spots and securing the fire's perimeter, according to Cal Fire.
Control of the incident is transitioning back to local fire crews Saturday morning, and officials hope to have the incident fully contained by Monday.
No injuries have been reported, although an abandoned outbuilding was destroyed.
PHOTOS: Crews battle fire near Livermore