The Pine Fire, located near Pine Flat Road west of The Geysers Complex and east of Geyserville in Sonoma County, was estimated to be 85-percent contained by the end of Tuesday, according to Cal Fire.
Approximately 630 firefighters were on scene Tuesday, with Cal Fire reporting three injuries.
Burning in heavy brush since noon on Monday, the fire is estimated to be around 300 acres, down from Cal Fire's previous estimate of 350 acres.
Cal Fire said full containment is expected at around 8 a.m. Wednesday.
The fire's cause is still under investigation, Cal Fire reported.
Resources Cal Fire reported to have on scene Tuesday included 21 engines, 30 fire crews, seven air tankers, four helicopters, 15 bulldozers and five water tenders.
The six homes previously reported to be in danger are no longer threatened, officials said Tuesday.
Pine Flat Road also has reopened, Cal Fire said.
Firefighting costs by day's end Tuesday were estimated at approximately $922,896, according to Cal Fire.
Cooperating agencies working on the fire include Cal Fire, California Department of Corrections and Rehabilitation, Sonoma County Fire, South Lake County Fire, California Highway Patrol, Sonoma County Roads, Pacific Gas & Electric, Sonoma County Sheriff, Geyserville Fire Department and CalEMA.
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