As its name suggests, the District's first school opened in the town of Lagunitas, before later moving - in 1928 - to a new schoolhouse in San Geronimo. The original 1908 Lagunitas School District one room schoolhouse is now a private home, on the hill above the Lagunitas Grocery building. An earlier San Geronimo School District originally served the San Geronimo Valley and its ranching families from 1872 to 1904 in a different one room schoolhouse near the intersection today's San Geronimo Valley Drive and Nicasio Valley Road. To read more about the District's history, click here.

The first principal at the District's new site on Sir Francis Drake Boulevard was the locally famed Isabel Cook, one of Marin's renowned educators of the 20th century. Cook brought her creative energy to the school, forming a theater company and sports program, as well as introducing outdoor education activities such as. Cook and her work at the school appear frequently in the newspapers of the day. To read more about Isabel Cook's history at Lagunitas, click here.