For this study we considered the influence of binge drinking behavior in college on students' critical thinking gains. Findings suggest that binge drinking has a negative influence on students' critical thinking gains over 4 years of college and that this effect was driven by students with the lowest levels of precollege critical thinking. In both a general binge drinking model, which compared students who binge drank during college with those who did not binge drink, and in a frequency of binge drinking model, which compared students who binge drank at varying frequencies during college with those who did not binge drink, students with lower levels of precollege critical thinking who engaged in binge drinking tended to have significantly lower critical thinking skills than those who did not binge drink.