The goal of this study was to examine the effects of urban forest program on environmental sensitivity, academic stress and academic achievement in high school students. Thirty high school students were assigned to an experimental group, which participated in weekly urban forest program, and thirty students to a control group. As a result, the experimental group showed the significant improvement in environmental sensitivity and academic achievement, and higher environmental sensitivity along with lower academic stress. The results suggest that, as urban forest program enhances environmental sensitivity of students, their academic stress was reduced, and the program may influence academic achievement positively.