Environmental protection, the practice of protecting the naturally created things, is one of the core values at St. Francis of Assisi High School. The school aims at contributing to the efforts made by individuals, organisations, and the government to conserve the natural environment which has been degraded to an alarming scale in the last century.
The school sits on five acres of land which is all covered with trees except in spaces where there are buildings. There are 32 species of trees on the compound; some naturally grew up while others were planted. Cutting a tree on the school compound is strictly prohibited unless it is absolutely necessary.
On 17 July 2019, the school took a deliberate decision to ban plastic materials, especially polythene bags and plastic bottles. Staff, students, and visitors are not allowed to bring into the school these materials.