In this study performing at Konya basin conditions, the aim was to determine the last irrigation time for grain maize production. For this purpose, the effects of five different irrigation-ending times [at milking stage (S1); 6 days after S1 (S2); 12 days after S1 (S3); 18 days after S1(S4) ; and 24 days after S1 (S5)] on grain yield were researched under field conditions. By comparison to first irrigation-ending treatment of S1, 80 mm more irrigation water was applied to the latest terminated treatment of S5. The results of the study showed that, effect of different irrigation-ending times on grain yield and gross income was found not statistically significant. However, maximum grain yield and gross income were obtained from S5 treatment. [ABSTRACT FROM AUTHOR]