Educating many generations of the local area, located in Rathdowney, Co. Laois, St. Fergals College was established in 1937. The classes were conducted in temporary locations before moving to the present site of the Conoboro Road. The school was initially planned to consist of four rooms however it opted for the construction of three instead.
The student population began to increase over the years and so did the development of the school. By 1987 a new building provided general-purpose classrooms, a gymnasium and administration facilities, as well as the introduction of uniforms. By 2012 a new building was complete, adding three new classrooms, a science room, an art room and new meeting rooms. This also involved joining all the buildings up for the formation of one school that is seen today. The student population has continued to grow and now consists of around 300 students and 28 teaching staff.