Injunctive norms, or perceived peer approval of drinking is a potentially important influence on college student drinking. Few studies on college student drinking have attended to injunctive norms during the first few months of college. Longitudinal data from 534 first semester freshmen are used to describe the contributions of injunctive norms to alcohol consumption. Injunctive norms were measured by peer approval of drinking and alcohol consumption was measured by the typical number of drinks consumed in the past 30-days while partying. Results indicate that injunctive norms were a significant predictor of drinking after controlling for gender and effects of time.