The main building, known as the Trianon (formerly called "Claremont"), is listed on the National Register of Historic Places.

In March 1962 it was renamed The Colorado Springs School for Girls when it dropped its affiliation with the Episcopal church.

The school opened in September 1962 with 23 students in the former home of Walter Drake and his wife on Pourtales Road with Margaret Campbell as its first Headmistress.

[4] By the spring of 1967, enrollment had nearly quadrupled and the board of trustees voted to purchase both the Trianon property at 21 Broadmoor Avenue and nearly 12 acres known today as Boddington Field.

The school has had ten heads of school: Margaret Campbell (1962-1974); Robert MacDonald (1974-1979); Jerel Cathey (1979-1983); Donald W. Fudge (1983-1986); George S. Swope (1986-1989); Mary Flemke (1989-2000); Mickey Landry (2000-2007); Kevin Reel (2007-2013); Aaron Schubach (2014 - 2020); and Tambi Tyler (2020 - 2023); Dr. Ryan Kelly (2024-current).