The King Fire grew another 1,000 acres by Saturday night to 81,944 acres, Cal Fire reported.
The wildfire, burning in El Dorado and Placer counties, is 10 percent contained.
The fire ignited last week near Pollock Pines, about 60 miles northeast of Sacramento. Wayne Allen Huntsman, 37, of Pollock Pines, was arrested Wednesday on suspicion of arson in connection with the blaze, Cal Fire officials said. He pleaded not guilty at his arraignment Friday. Huntsman is being held in El Dorado County Jail on $10 million bail, according to the jail's website.