Cal Fire will send 75 firefighters from San Diego County to battle a 3,000-acre fire burning near Interstate 5 north of Los Angeles.
Cool temperatures and decreased wind speeds have helped firefighters gain ground on the wildfire that forced evacuations and a school closure.
Strong winds pushed the fire, which was reported at 1:20 p.m. Wednesday, south and east toward the Hungry Valley State Recreation Area and Gorman Tuesday. Flames eventually spread into portions of three counties -- Kern, Ventura and Los Angeles.
The fire burned about 2,000 acres in under three hours and continued moderate spread in "very steep and hilly" throughout the afternoon. Water-dropping helicopters and air tankers helped crews slow the wildfire's advance.
No structures were threatened.
Containment was at 10 percent early Thursday after the fast-moving fire scorched trees and brush west of the 5 Freeway Wednesday afternoon.
Authorities have not determined a cause of the blaze, which was burning about 70 miles northwest of downtown Los Angeles, south of the Grapevine that links the metropolitan area to the Central Valley.
View California Fire Map in a larger map