Scientists from the USDA Forest Service's Rocky Mountain Research Station and Oregon State University assessed cross-boundary wildfire exposure in the western United States by mapping potential fire transmission among public and private lands, and identifying areas where ignitions are most likely to expose communities to wildfire. Results are highlighted in Cross-boundary Wildfire and Community Exposure: A Framework and Application in the Western U.S. (GTR-392). The report's findings directly support USDA’s shared stewardship initiative that aims to address concerns related to fuel loads, community exposure, and cross boundary fires. The results underscore the “all lands” nature of the wildfire problem in the west and helps state, federal, and local fire planning organizations prioritize strategic forest management activities to reduce wildfire hazards. The cross-boundary assessment relies on fire simulation modeling and identifies specific zones of potential fire exchange between Forest Service lands, other landowners, and communities. The assessment maps 240 million acres where wildfire ignitions can potentially impact over 1,800 communities with significant wildfire exposure. The communities were ranked in terms of their predicted exposure. Community “firesheds” (meaning the lands surrounding communities where ignitions are likely to cause fires that spread to the urban interface) were mapped for each community and the contribution from different landowners was identified. In this way, communities now have information to understand the scale of wildfire risk and the contributing lands.