During the devastating 2020 fire season, dry conditions and lightning events sparked three of the top five largest fires in California history. The fire that damaged the most structures happened in 2003, in Southern California.
This list only includes fires after 1932, but Cal Fire says there is no doubt that there were fires with significant acreage burned in the years prior. Pre-1932 records are less reliable. Table:Liz LindqwisterSource:Cal Fire Stats & Events