Two varieties of cotton were grown in 1991-1993, and were harvested at approximately one week intervals to determine the influence of delayed harvest on cotton yield and quality. Harvest date significantly influenced yield and quality. Yield increased for about 30 days after defoliation, and then decreased with major yield loss being associated with rainfall. Lint grade was highly influenced by rainfall. This study indicates a harvest window of about 30 days after defoliation is available before significant yield and/or grade is lost.