The need for a novel enterprise-level crop yield model under climate change is established. A model for the approximation of enterprise-level crop yields under climate change is proposed based on the state-contingent approach. The proposed model integrates both economic and agronomic notions of crop production. A general computational strategy for the model is provided. The strategy introduces a novel geometrical interpretation of the coefficient of risk-aversion, which is intrinsic to the farmer, as well as an approach to infer this coefficient of risk-aversion from farm-level accounting data.