Cotton aphid, Aphis gossypii Glover, response to nitrogen fertility and planting date was investigated at the Texas Agricultural Experiment Station at Chillicothe in 1992-1994. Nitrogen was applied at 0, 32, 62, and 88 lb./acre just prior to planting cotton in late April, late May, and late June. Aphid density and percentage leaf nitrogen were estimated once a week. There was a significant, positive linear correlation between aphid density and fertility level in the late May planting date only. Nitrogen fertility levels of 62-88, 32-62, and 32 lb/acre are recommended for cotton planted in late April, late May, and late June, respectively; these levels provided acceptable yields in each planting date without increasing severity of cotton aphid infestations.