The school first opened in 1936, and held its 75th anniversary in late 2010. In 2011, the school had the highest
National Certificate of Educational Achievement (NCEA) pass rates for state boys' schools in New Zealand. Among the results, the level one score averaged at 93.4% (a significant increase from 71% in 2008). In 2017, NCEA pass rates continued to be above the national average, with NCEA Level One averaging 96.6%, and Level Three averaging 90.0%. King's had 722 pupils in 2007, growing to 1,008 pupils in 2014, the highest roll in King's 78-year history. The size of the roll also meant that King's became the largest school in the Otago region, overtaking
Taieri College in the process. (the school has since been overtaken as the region's largest by
Wakatipu High School in
Queenstown). Since then, student numbers have remained steady, measuring 1,041 students in 2018. In mid February 2021, King's High School attracted domestic media attention after a 16 year old
African-American student was told by the rector that he could not wear
cornrows. His parents and older sister objected to the cornrow ban, describing it as racist, discriminatory, and ignoring its cultural significance to African Americans. The rector initially defended the cornrow ban as part of Kings' uniform policy. In response to media and public interest, the rector amended Kings' uniform policy to recognise cultural needs when students' hairstyles were considered; allowing the student to wear his cornrows while attending the school. == Enrolment ==