As of 6:51 a.m., the blaze was kept at 33 acres. It was first reported around 8:15 p.m. Monday in the 4700 block of Quimby Road.
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The fire still a potential threat to life or property, Cal Fire said. Evacuation warnings remain in place.
"Those who require additional time to evacuate and those with pets and livestock should leave immediately," Cal Fire said.
Crews have struggled to contain the fire due to the tough access and terrain in the area, according to Cal Fire, which noted that at least 115 personnel were assigned to extinguish the blaze.