The Latest on California wildfires (all times local):

7 a.m.

At least 300 homes are threatened by a growing wildfire chewing through timber and dry brush in a remote area of California's Santa Cruz Mountains.

Cal Fire says Wednesday that the destructive blaze south of San Jose has grown to more than 3.5 square miles. It's just 10 percent contained.

Evacuation orders are in place for residents of several canyons and other rugged areas, some accessible by only dirt roads.

One residence has been gutted by flames and at least six outbuildings are destroyed.

The blaze broke out Monday during a statewide heat wave that brought witheringly low humidity and temperatures in the upper 90s.

To the north in Sonoma County, crews extinguished a fire Tuesday that destroyed four houses in a neighborhood in Petaluma. Several other homes were damaged.