This assessment, funded by CDKN and SUMERNET, makes up the first part of an on-going study on the vulnerability of crops in Vietnam to climate change that will be conducted by CIAT. The crops in this assessment pertained to Vietnamese study sites for the SUMERNET funded Participatory Social Return on Investment (PSROI): Greater Mekong Subregion Climate Change Adaptation Planning and Costing Project. This study complements a similar assessment conducted by CIAT, with the support of GIZ, on crop suitability and land use in Lao PDR in 2010. Both products aimed as assisting with climate change adaptation decision-making. This assessment is being submitted as a project output to the SUMERNET secretariat, and is intended for publication along with the forthcoming assessment of all priority crops in Vietnam.