The Senior School is for girls between the ages of 13 and 16 years, after which they will progress into the Sixth Form.

Kilgraston's responsibility is to enable every pupil to achieve her potential. By helping to develop intellectually, Kilgraston girls are taught to use their talents and to attain their personal best. The excellent, experienced staff and support for learning ensures that each girl – however gifted – will be encouraged to achieve.

At Kilgraston the House and boarding systems combine to provide a successful environment for day pupils who participate fully in all areas of school.