Horton High School students compete in numerous academic competitions, such as the math, computer science, and chemistry contests run by the University of Waterloo and the American Mathematics Competitions (AMC).

[citation needed] Girl Division 2 won NSSAF provincial championship in 2014-2015[citation needed] Horton's boys' basketball team was nearly unbeatable for two years.

In December 2008, Horton broke the Canadian national record with their 73rd straight win.

Horton boys and girls basketball won 2015-16 provincial Division 1 championship.

The JV girls soccer team has won five provincial championships in a row from the years 2017-2021.