Asthma has high morbidity and mortality among adolescents and among youth from non-urban (i.e., rural and suburban) communities, both of whom are seldom included in asthma intervention research. This study will test the effectiveness and cost-effectiveness of high school-based intervention delivered by Community Health Workers (CHWs) to non-urban adolescents with uncontrolled asthma, and will examine factors associated with delivery of the intervention.