The evaluation reported in this article examined the effectiveness of a statewide bullying prevention program, Be SAFE. Be SAFE involves use of a positive youth development approach to influence peer groups rather than individual bullies or victims. Through the use of pre- and postprogram questionnaires, we found increases in youths' knowledge of how to help someone being bullied and how to be an ally. We found that grade level was associated with youths' knowledge gains across the lessons. The findings from the evaluation can be important for those interested in understanding the impacts of Be SAFE or applying bullying prevention efforts in general.