Here is an interesting interactive graphic that depicts perimeters of more than 100 years of California wildfires recorded by Cal Fire and the U.S. Geological Survey. The map below shows all the cumulative fires from 1878 to 2018. It seems as if there is very little of California that has not been touched by wildfire. Large areas of desert in the southeast are mostly untouched due to lack of vegetation.
I remember watching the Santa Monica Mountains burn from our living room bay window in Rancho Park. Several times.