The research evaluated the efficacy of an intervention to reduce the onset and extent of binge drinking during the 1st year of college. The approach was on influencing the students before they start college, through their parents, during the critical time between high school graduation and the beginning of college. Specifically, parents were educated about binge drinking and how to convey information to their teens, and then encouraged to talk with their teens just before their teens embarked on their college education. Teens whose parents implemented the intervention materials were compared with a control sample during their 1st semester on drinking outcomes, perceptions about drinking activities, perceived parental and peer approval of drinking, and drinking-related consequences. As anticipated, teens in the treatment condition were significantly different (p < .05) on nearly all outcomes in the predicted directions (e.g., lower drinking tendencies, drinking consequences). The benefits of a parent-based intervention to prevent college drinking are discussed.