Mizzou Academy / University of Missouri High School classes allow students to study when and where is best for them. Depending on the course format students select and the semester, certain key dates apply.

Course Dates

Enrollment is year-round: 24/7 for Flexible Format courses. AP courses follow traditional U.S. high school fall and spring semester format.

2021-22 AP Course Calendar Dates

Fall Semester: August 18, 2021 – December 17, 2021
Spring Semester: January 5, 2021 – May 20, 2022

The 2020 AP Exams will be administered over two weeks: May 3-14, 2021.


The University of Missouri has eight (8) official holidays which are counted in the number of days in the course to allow for these dates (ex. if a course ends on a university holiday, an additional day is provided). Mizzou Academy / University of Missouri High School Support Staff will not be available on these dates.

When a holiday falls on Saturday, the preceding Friday is observed. When a university holiday falls on Sunday, the following Monday is observed.

  • New Year’s Day — Jan. 1
  • Martin Luther King Jr. Day (3rd Monday in January)
  • Memorial Day (last Monday in May)
  • Independence Day — July 4
  • Labor Day (1st Monday in September)
  • Thanksgiving Day (4th Thursday in November)
  • Friday following Thanksgiving
  • Christmas Day — Dec. 25

Other Important Dates