This technical paper applies an agro-ecological zone (AEZ) analysis to California’s landscape in order to develop a spatially specific (mapped) understanding of the state’s zones of agricultural suitability and productivity.  Employs statistical analyses of climate, topography, soils, and water to define AEZ types that provide information on geophysical factors, such as temperature and precipitation, upon food production. Results from this AEZ analysis can be used to develop future scenarios of eater and/or market demand and each zones production possibility in light of that demand.  Results can also be used to assess the implications of shifts in any of the underlying geophysical factors, such as water or climate.  The paper examines the possibility of one such scenario; it applies climate change research to the state’s agricultural landscape and finds that under that scenario the quality of the state’s farmland exhibits significant degradation.