Three cotton simulation models were compared based on their predictions of water movement under growing conditions of the Texas High Plains. Models tested were GOSSYM, COTONS, and Cotton2k. Model predictions of soil water content by layer and cumulative evapotranspiration were examined. With appropriate initial conditions, all three models were capable of predicting soil water contents close to measured values. Cotton2k predicted cumulative evapotranspiration satisfactorily while predictions from COTONS and GOSSYM were lower than measured values. The potential of modeling in irrigation management decisions will be discussed.