The Mountain Fire broke out near the town of Camarillo on Wednesday.
Its cause is still unknown, but the flames spread quickly thanks to powerful winds, with gusts of up to 130 km/h.
It threatens more than 3,500 homes and has already consumed nearly 8,100 hectares.
“We stayed up all night watching what was happening. I didn't sleep,” Erica Preciado told local television station KTLA as she evacuated her family.
“We're just trying to get shelter. I didn't even know what to take. I just put everything I could in my car,” she added, on the verge of tears.
Authorities are currently trying to assess the number of homes destroyed.
According to local media present on site, there are dozens of them and could even reach a hundred.
“Everything is gone,” said a man with a broken voice on KTLA, who lost his home where he had lived for 27 years. “Everything is gone.”
After two rainy winters which provided a relative respite, California is experiencing a very active fire season this year.
The vegetation reformed thanks to the precipitation of the last two years has dried up and becomes a powerful fuel.
This summer, the “Golden State” suffered from several heat waves, signs of global warming.
In July-August, it suffered the fourth largest fire in its history.
– Dry fire hydrants –
Ventura County fire officials said they are devoting all their resources to the fire.
Helicopters dropped water on the area throughout the night. Several hundred firefighters defend the houses with fire hoses.
The fight against the flames is so intense that the hydrants to which fire trucks connect were dried out by demand at one point Wednesday evening.
“We flushed the water systems,” Ventura County Fire Chief Dustin Gardner said at a news conference Thursday.
This forced his teams to transport water to the various fire sources.
The flames are driven by the Santa Ana winds, hot, dry gusts from the desert, typical of fall in Southern California.
Local weather services issued an alert this week, warning of the risk of fires.
These winds should gradually lose their strength on Thursday, before “a considerable reduction” in the evening, explained meteorologist Rich Thompson.
Power companies cut power to tens of thousands of customers in the area, a common strategy in California during high winds, to reduce the risk of new fires caused by toppled power lines.
