We present results from ongoing research into 20th Century fire regimes in two large Rocky Mountain wilderness areas. Fire patterns are represented as digital fire atlases based on archival forest service data. We find that spatial and temporal fire patterns are variable in space and time and related to landscape features, climate, land use history, and changes in fire management strategies. This research provides contextual information to guide fire management in these (and similar) areas in the future. © University of Idaho 2000. Abstract reproduced by permission.