Washington Large Fire dataset represents large fires in Washington State typically over 100 acres, but smaller perimeters have been included when data is available.

Collecting accurate large fire perimeters is a coordinated effort between federal, state and local agencies. The Northwest Coordination Center in Portland, Oregon heads this effort by compiling daily fire perimeters from the National Interagencey Fire Center (NIFC) ftp site during fire season and at the end of each calendar year. The purpose of this data is to provide consistent spatial data throughout Washington for management, planning or analysis involving fire history. Fire perimeter polygons represent final fire perimeters provided by jurisdictional agency, local agencies or Incident Management Teams assigned to the fire. Final products for each polygon are maintained at the local level to track the area affected by fire. This dataset dates back to 1973, some data may be missing or inaccurate. DNR works in coordination with other agencies to make every attempt to get complete and correct data at the end of each fire season.