The Thomas Fire is About to be the Biggest Wildfire in California History The fire has raged for over two weeks, destroying over 270,000 acres. According to the California Department of Forestry and Fire Protection, over 1,000 buildings have been burned. So far, only 50 percent of the fire has been contained, with authorities predicting January 7 as the day it will completely contained. The Thomas fire is the third largest fire in California since records began being kept in 1932. The largest fire in state history was the Cedar Fire in 2003, which burned 273,246 acres.