The wildfire, which has been burning since July 15 near Idyllwild, is now 91 percent contained, fire officials said. Full containment was forecast for Friday.
Rain has aided the firefighting effort. But the loss of plant cover on steep slopes has created new dangers because there is nothing to hold soil in place.
A voluntary evacuation order was issued for an area in Apple Canyon.
The fire burned in mountainous terrain with much of the area unreachable by road. That slowed the firefighting effort.
Scores of houses and other buildings have been destroyed.