 Hillsborough High is one of four Hillsborough county public high schools with an International Baccalaureate program.Hillsborough High School is one of the South's oldest high schools.Although mystery surrounded the beginning of the school for many decades, in 2003 discovered documents preserved in the cornerstone of the HHS building of 1911 have confirmed that the school had its first students in 1882, and graduated its first class of four students in 1886 (Class of 1885–1886).