Los Angeles, California (CNN) -- Winds have calmed in Southern California, helping firefighters double containment of a wildfire in Kern County, authorities said.
All evacuation orders have been lifted and schools closed because of the threatening flames will resume classes on Thursday.
But more than 1,000 firefighters continue to battle the "Post" fire, which has burned 1,000 acres, authorities said Wednesday evening.
"Significant progress was made ... constructing fireline," Kern County fire and U.S. Forest Service officials said in a statement. "In addition, mop up activities were also conducted, to ensure no hot spots remain inside the containment line."
Firefighters will focus on completing the construction of fire lines along the western edge of the fire on Thursday, the officials said.
No structures are being threatened by the wildfire that is 60 percent contained, the fire department said.
The fire in Lebec, about 75 miles north of Los Angeles, is actively burning. It started Tuesday afternoon.
No injuries have been reported, fire officials said.
The cause of the fire is under investigation.
CNNRadio's Matt Cherry contributed to this report.