[3] Fallbrook Union High School competes in the Avocado League and in Division III CIF.
The school also competes in the boys' sports of baseball, basketball, cross country, football, golf, lacrosse, rugby, soccer, swimming, tennis, track, volleyball, water polo, and wrestling, as well as competing in the girls' sports of basketball, cross country, field hockey, golf, gymnastics, lacrosse, rugby, soccer, softball, swimming, tennis, track, volleyball, and water polo.
In the 1930s, the Public Works Administration Project approved a grant of $34,000, 45% of the cost of a new auditorium-gymnasium-cafeteria, a pool and grading of a sports field.
[citation needed] In 1946, the State Department of Education rated Fallbrook to be the best small high school in California.
In 1948, the State of California declared that the main part of the school building did not meet earthquake standards and was condemned.
The 46,000-square-foot project was delayed due to county-wide strikes by brick masons and an unusually rainy year.
[6] In 2016, district residents approved issuing $45 million in bonds for upgrading classrooms and facilities and improving school security.