Process level crop models have been shown to be effective management tools when adequate resources are available to utilize them. They have, however, been difficult to use in large scale farming operations. Recent advances in Geographical Information System (GIS) technology have provided an avenue for reducing much of the overhead associated with site-specific application of such tools. Using GIS, it is possible to develop the tools necessary to reduce the record keeping demand and implement crop simulation models in the precision farming paradigm. The first stage of a fully integrated crop model in a desktop GIS has been accomplished and shown to reduce the complexity of site-specific model implementation at farm level.