Check out this interactive map that shows the perimeters of wildfires that have burned in California from 1878 to 2018 using data from the California Department of Forestry and Fire Protection and the U.S. Geological Survey. The wildfires are categorized by the year in which they started. Perimeter information from fires that started between 1878 and 2017 comes from Cal Fire, while information on the Thomas Fire and fires that started in 2018 comes from the USGS.