Purpose: This paper aims to present and describe the main actions carried out in six different faculties and common areas such as cultural and research centres and administrative buildings in the Ferrol campus at the University of A Coruña to achieve the second green flag on a Galician University. Design/methodology/approach: A case study describing the steps for implementing a green campus programme in a medium-size, young university campus integrated into a small city. An Environmental Campus Committee was created to assess the main factors that affect environmental footprint, discuss sustainability initiatives and develop a guide to action regarding different goals related to sustainable transport options, energy, water conservation and waste reduction. The actions included several fields such as education, circular economy and healthy life and involved the on and off-campus community. Findings: The programme achieved a decrease in water consumption and electrical energy. An important change in educational values and behaviours regarding sustainability was observed in and out of the campus community. The measurements adopted mainly in waste management, mobility and education led the Ferrol campus to achieve a green campus flag on November 2019. Originality/value: This experiment can serve as a guide to establish the Green Campus philosophy in other similar university campuses.