"The Federal Fire Occurrence Website is an official government website that provides users with the ability to query, research and download wildland fire occurrence data. The data available through this website contains over 677,000 fire records collected by Federal land management agencies for fires that occurred from 1980 through 2013 in the United States. [...] The fire occurrence data layer compiled for this application is a collection of fire records from the following six federal agencies under the United States Department of Interior (DOI) and the United States Department of Agriculture (USDA): Bureau of Land Management (BLM), Bureau of Indian Affairs (BIA), Bureau of Reclamation (BOR), U.S. Fish and Wildlife Service (FWS), National Park Service (NPS), and U.S. Forest Service (USFS)."
U.S. Geological Survey: http://www.usgs.gov/