[3] Despite being owned by the States of Jersey, JCG charges tutition fees – of £2,666 per term in the 2024/25 school year.

The then Bailiff of Jersey, Sir Robert Pipon Marett, became patron of the enterprise and an advertisement appeared in the British Press and Jersey Times in June 1880 to announce the forthcoming opening of the new college in September of that year: "It is designed to give to the daughters of residents and others, at an extremely moderate rate, an education of the highest order.

[5] The school was opened in September 1880 as Jersey Ladies' College, located at Adelaide House in Roussel Street, Saint Helier.

Girls were put in for Oxford and Cambridge Local Examinations and Matriculation of London University, and those who had studied in France were able to take the Brevet de capacité in Paris.

[5] In 1887, the Ladies' College acquired property at La Pouquelaye, fronting Rouge Bouillon, in Saint Helier.

The Germans occupying Jersey during World War II used the school building first as a barracks and then as a naval hospital.

The six school houses are Austen Bartlett (Jane Austen and Marie Bartlett),[13] Cavell (Edith Cavell), Curie Fry (Marie Curie and Elizabeth Fry), Garrett Anderson (Elizabeth Garrett Anderson), Inglis (Elsie Inglis) and Nightingale (Florence Nightingale.