Policy initiatives such as the Collaborative Forest Landscape Restoration Program (Rep. Holt, 2009) have emphasized landscape-scale (> 10,000 ac) fuel reduction treatments to mitigate adverse impacts of large, uncharacteristic wildfires in the western United States. Over the past two decades, a nuanced understanding of the design and implementation of stand-scale treatments that reduce the behavior of future fires and enhance fire suppression capabilities has been developed across the western US. These approaches are referred to as fuel reduction treatments and involve the purposeful use of silvicultural methods to alter the fuels complex and reduce the behavior and effects of future fires. Although fuel reduction treatments are commonly implemented at stand scales, previous research has suggested that the strategic placement of fuel treatments across a landscape can effectively reduce fire's negative impacts. However, the implementation of strategic landscape- scale treatments is complicated by the large areas that require treatment to achieve beneficial landscape-scale effects and legal and physical constraints associated with land use and access and our conceptual understanding of the complex interactions between fuels complex, topography, and atmosphere on landscape scale fire behavior. Failure to consider these interactions has limited the development of theoretical frameworks that describe the influence of fuel treatment patterns and amount on landscape-scale fire effects and reduces the applicability of any gained knowledge to real-world landscape-scale fuel treatment planning. Our overarching objective was to increase our understanding of the mechanisms that influence the effectiveness of landscape scale fuel treatments. More specifically we 1) developed and evaluated a new level set approach for landscape scale fire spread in WFDS and an open-source stand scale fire behavior in the R programming language, 2) Investigate how proportion of landscape treated and treatment placement influence landscape-level fire spread patterns and behavior across a suite of topographies, and 3) Investigated how treatment placement influences landscape scale fuel treatment longevity.