[citation needed] In 2021, Glenbard South had an average composite SAT score of 1054.5, and graduated 95.1% of its senior class.

[10] Glenbard South has made Adequate Yearly Progress on the Prairie State Achievements Examination, a state test part of the No Child Left Behind Act.

[11] The staff includes approximately 112 teachers, of whom 91.5% hold an advanced degree.

[6] The boys' cross-country team won the Class AA Illinois state championship in 2001–02.

[13] In 2007, the boys' track and field 4X800m relay team won the Nike Outdoor Nationals competition with a time of 7:40.57.