Thirteenth grade

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Thirteenth grade or grade thirteen is the final year of secondary school in some jurisdictions. In some locales it is compulsory, while it is optional in others.


The Ontario Academic Credit (OAC) (French: Cours préuniversitaire de l'Ontario or CPO) was a fifth year of secondary school education designed for students preparing for post-secondary education that existed in the province of Ontario, Canada. The OAC curriculum was codified by the Ontario Ministry of Education in Ontario Schools: Intermediate and Senior (OS:IS) and its revisions. The Ontario education system had five years of secondary education, the fifth year known as "grade 13" from 1921 to 1988. Then, grade 13 was replaced in 1983 by the OAC for students starting high school (grade 9). The OAC continued to act as a fifth year of secondary education until it was phased out in 2003.[1]

United States[edit]

Most jurisdictions in America require or offer only twelfth grade as the final year of secondary school. Some school districts in Oregon offer a thirteenth grade.[2][3][4][5][6] In North Carolina, early college high schools may provide last 5 years, providing a grade 13.[6]


  1. ^ Brady, Patrick; Allingham, Philip (18 November 2010). "Pathways to university: The "Victory Lap" Phenomenon in Ontario/journal=Canadian Journal of Educational Administration and Policy" (113).
  2. ^ Schuman, Rebecca (2014-10-22). "Welcome to 13th Grade!". Slate. ISSN 1091-2339. Retrieved 2018-04-09.
  3. ^ "Five-year high schools increasingly common, 'a creative disruption,' and soon to show improved graduation rates". Retrieved 2018-04-09.
  4. ^ "A fifth year in high school: How it works to get students a free year of college". Retrieved 2018-04-09.
  5. ^ "Oregon to revise definition of high school 'graduate'". Retrieved 2018-04-09.
  6. ^ a b Pannoni, Alexandra (May 4, 2015). "13th Grade Offers Some Teens an Easier Transition to College". Retrieved April 9, 2018.
Preceded by
Twelfth grade
Thirteenth grade
ages 18–19
Succeeded by
Higher education