This study was conducted during the school year 2014-2015 primarily to assess the level of environmental management practices of high school students. The researchers gathered data from 130 high school students at Quirino State University Laboratory High School. A survey checklist was used as data gathering instrument. The gathered data were analyzed using frequency counts, percentages, t-test, and ANOVA. Among the salient findings of the study were as follows: the high school students of Quirino State University Laboratory High School are mostly females; majority of them belong to the age bracket of 14-15 years old and are 4th year students. The respondents often adapt environmental management practices along energy-keeping practices, water-saving practices, and biodiversity promotion practices. The profile of the respondents appears to have influenced the level of adaptation along energy–saving practices, water-saving practices but not in biodiversity promotion practices.