This study was conducted to determine the effect of Outdoor Education program on environmental attitudes among secondary school students in Sabak Bernam district. This study is a quantitative study which uses quasi -experimental pre -test and post -test design. The study population consisted of secondary school students from 17 secondary schools in Sabak Bernam district). A total of 160 students were systematically randomly selected and divided into two groups, namely the treatment group of 80 students following the PPLU program and the control group of 80 students following the Uniformed Unit Prime Camp (PPUB) program. The main instrument of this study is the Enviromental Attitudes Knowledge & Scale (EAKS) questionnaire which has 36 items of Attitudes Towards the Environment question. The findings of the study were analyzed using several analysis of the study, namely percentage, independent t test and paired t test. Multiple regression analysis was also used to find factors influencing the relevance of individual attitude changes. The findings of the study stated that students living in the city were seen to have a significant change in attitude towards the environment after completing the PPLU camp program.