A spatial analysis of a long-term simulation carried out with AEGIS/WIN, a Geographic Information Systems (GIS) interface of DSSAT crop simulation package, is described. The case-study is referred to a 600 km 2 area (Foggia, Southern Italy), characterized by 481 soil samples collected at a regular grid. Durum wheat has been simulated punctual-based using soil and long-term weather data. Mapped output variables allowed checking the areas more or less suitable and productive for durum wheat and stable from a temporal point of view. Soil water holding capability influenced the above productive variables of not-irrigated wheat.