Many practitioners and researchers describe academic and environmental benefits of environmental education for kindergarten through twelfth grade (K-12) students. To consider the empirical underpinnings of those program descriptions, we systematically analyzed the peer-reviewed literature (1994-2013), focusing on outcomes of environmental education programs with K-12 students. In the resulting sample of 119 articles, we identified 121 unique outcomes, finding that most articles reported positive findings from the programs under study. Reflections stemming from the review highlight the versatility of environmental education, while also suggesting opportunities for bolder and more diversified approaches in research design and thinking.