The Holser Fire has burned about 167 acres, according to the Angeles National Forest.
Evacuation orders were issued for several nearby zones but have since been lifted.
Evacuation warnings remain in place for the following zones:
-PIRU 01
-PIRU 14
-CDER 01
For the latest evacuation orders and warnings, click here.
"Multiple helicopters, including Fire Hawks 4 and 5 and mutual-aid aircraft, are working the fire," the Ventura County Fire Department said. "Multiple air tankers are also making retardant drops in support of ground crews."
More than 200 firefighters and 80 fire engines are currently assigned to the incident, the department added.
Residents are urged to avoid the area.
This comes as the National Weather Service extended the Extreme Heat Warning for the northern Ventura County mountains through 8 p.m. Sunday.
A Heat Advisory is also in effect for most of the rest of the county, including many coastal areas.