This cross-sectional study was undertaken to determine the impact of a behavior support program implemented in elementary school on students' high school behaviors. The research question driving the study was whether high school students who had received instruction in the Students Taking Appropriate Responsibility (STAR) program for four years during elementary school exhibited more self-regulation on selected measures of student behavior than students who had not received such instruction. Independent samples t-tests comparing behaviors in the entire treatment population with the randomly selected control population revealed a statistically significant difference in attendance for twelfth graders. Non-significant findings included fewer missed days by ninth and eleventh graders in the treatment population and fewer discipline incidents by ninth graders in the treatment population. No differences were found between populations in the tenth grade nor in drop-out status. These findings suggest the STAR program in elementary school had positive enduring impacts on participating students' behaviors during high school.