CalFire says the rugged terrain is making it difficult for its crews to reach the flames.
RELATED: Track wildfires across Bay Area, other parts of California with this interactive map
The wildfire, called the Dixie Fire, is now 12% contained. That's a 3% improvement from earlier Saturday morning.
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Evacuations remain in place, but firefighters are hopeful nearby neighborhoods are safe.
No buildings have been lost.
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Firefighters say instead of digging new containment lines, they've been able to re-enforce some of the ones they dug for the Camp Fire in 2018, which has saved them some time.
VIDEO: Fire Weather Watch issued for parts of Bay Area this weekend due to possible dry thunderstorms
Fire Weather Watch issued for parts of Bay Area this weekend