In 2012 Cosumnes Oaks was officially accredited by the Western Association of Schools and Colleges (WASC).

The school serves students in the south-central end of Elk Grove and several communities near Cosumnes River Preserve and Stone Lakes National Wildlife Refuge.

Cosumnes Oaks Geography teacher Monte Antonio Reed, who was also a freshman football and basketball coach, was convicted of child sexual abuse of three Cosumnes Oaks students, a 15 year old student who was enrolled in his honors class and her younger sister and cousin.

[4] In 2016, Cosumnes Oaks was in the news after school officials had an African-American student removed from his graduation ceremony by Sacramento County Sheriff's Department officers because he refused to take off a kente cloth representing his Ghanaian heritage.

Only items issued or approved by the district were allowed to be worn during the graduation ceremony.