Before long, two Pasadena mothers—Margaret Brackenridge and Alexander Duer—began planning a school for girls near the Arroyo Seco, and Ranney was their choice of headmistress.

In 1958, Westridge parent Henry Dreyfuss added a larger and more functional stage to Braun Music Center.

In 1997, the school began a building program to enable the campus to better serve the needs of Westridge students and the space demands of an expanded, modern curriculum.

The three-building complex also designed by Pica & Sullivan Architects, contains humanities classrooms and faculty offices, Upper School art studios and photography labs, art and photography exhibition space, the school's largest technology lab, and the Herrick Commons dining room.

The following year brought the addition of the Rokus Athletic Complex where Tiger soccer and softball teams host games on new regulation fields.

The formal uniform includes a white pleated skirt and the traditional button up shirt that has the Westridge ivy logo on the pocket.

This grants students the availability to take their studies outside of the classroom and possibly travel to different parts of the city, state, or even to other countries.

For Lower School, Discover Week combines hands-on creative learning on campus with day trips to local environments related to their projects.

In Middle School, the seventh and eighth graders spend the week together in outdoor, technology-free educational experiences.

Clubs and affinity groups at Westridge join girls with similar interests together to share knowledge, spread passion, and affect change.

Previously (in the mid-1970s), the Westridgettes were called the "Tigettes," and wore orange t-shirts, green gym shorts, and tiger feet.

SOF is free and open to the public, and local, national, and international program options are available for girls and boys, pre-K through 12th grade.