[2] The minutes of St. Philip's show that the church resolved to build a "free school", paid for by subscription in 1793, when it was slowly re-establishing itself after half the pre-Revolutionary congregation, including its pastor and warden, had fled the country due to their Loyalist sympathies.

In 1866, when the state designated it the Garrison Union Free School District, it moved to donated land slightly further north along the present Route 9D.

In 1908 the first part of the current building was erected opposite the church on land donated by the family of recently deceased railroad executive Samuel Sloan.

[3] Continued growth required the addition of another wing in 2002 to provide a gym, eight classrooms and a computer lab for the middle school students.

In 2007-2008 the boys of the graduating class of 2008 led the soccer and lacrosse modified teams to undefeated seasons for the first time ever.