The school first opened in September 2000 with a freshman and sophomore class of 120 students.

[4] The school's student to college counselor ratio is 37:1 The Lisa Argyros and Family Science Center houses learning and teaching space for biology, chemistry, physics, interdisciplinary study of science, and long-term research, and the 30,000 square-foot studio features the Kazu Fukuda Black Box Theater.

On December 7, 2023, Newport Beach Planning Commission unanimously voted to approve the development of Sage Hill’s middle school, allowing construction of the three-story middle school building and increasing Sage Hill’s maximum student enrollment from 600 to 750 students.

Effective July 1, 2024, Joseph Moody was named as the inaugural director of the middle school.

[7] The school offers 22 interscholastic sports totaling 42 teams at all levels of competition.