The historic school grounds in North Franklin Township date back to the 1850s when Joseph McKnight built a home on top of a hill overlooking the then-borough of Washington, Pennsylvania.

This twenty-five room Italianate mansion called Spring Hill now functions as the district's administrative offices connected to Trinity High School.

[6][7] William Wrenshaw Smith was a devout Episcopalian and longtime vestryman at Trinity Episcopal Church, then located on Beau Street near Washington and Jefferson College.

During the 1860s, Smith worked alongside John Barrett Kerfoot, newly elected Bishop of Pittsburgh, to create a boys’ school following the curricular model of famed priest-educator William Augustus Muhlenberg.

Then in 1925 the townships of Amwell, Canton, North Franklin, and South Strabane purchased the Trinity Hall property to repurpose as a joint public high school.

Football, baseball, basketball, soccer, cross-country, track, wrestling, volleyball, golf, rifle, lacrosse, ice hockey, swimming, softball, tennis, and cheerleading are available at Trinity.