The Williams Fire in the Angeles National Forest near Los Angeles is still just 5% contained as of Tuesday morning.
The fire Started on Sunday and has grown to about 5,000 acres.
Four people have been injured and two of them are firefighters.
Campgrounds and picnic areas are closed and will most likely stay that way for the upcoming weekend.
Firefighters warn that fire season is far from over and people need to stay vigilant. "Though it's technically the end of summer, the potential for large fires and devastating fires is still very high," said Captain Ryan Michaels with Cal Fire.
When it comes to fire danger, Cal Fire says this time of year can be one of the worst because of drought conditions throughout the state, seasonal thunderstorms and hot temperatures. "There's always a threat of extremely devastating fires still to come," said Captain Michaels.
This holiday weekend was a busy one for hundreds of firefighters battling the Williams Fire. The fire started Sunday afternoon and exploded overnight to more than 4,000 acres.
The terrain is very dangerous, it's very hot and the winds are picking up. "It makes every aspect of the fire fight more difficult. It's difficult to move equipment and personnel into the fire area; a lot of of windy canyon roads," said Tony Imbrenda with LA County Fire.
In Kern County, the Slides Fire is also keeping firefighters busy. It's at 50% containment.
Cal Fire warns folks to keep a defensible space around their homes and be mindful that the next couple of months is still wildfire danger.