The success of the bio-based energy industry will require accurate and timely assessments of available feedstock. This session is intended to present various approaches to estimating current and future supply of biomass feedstock from regional to continental scale. Topics will include field work on bioenergy crops, compilation and analysis of regional field data, and mapping of estimated yields over large regions. Additional focus will be on methods, including geostatistics, classification of remote sensing for cropland delineation, development or revision of existing plant models to estimate yields, and use of agricultural economic models to predict future adoption of biomass feedstocks.