The Cobb County School Calendar for the 2020 to 2021 school year began on Monday, August 17, 2020 and ended on Wednesday, May 26, 2021.  The start date was sixteen days later than last year, and the end date was six days later than last year.

Cobb County Schools were open for in-person learning or virtual learning online.  Schools were open to students in person on Monday, Tuesday, Thursday, and Friday.  Wednesday was a virtual only Instructional Support Day for all students.

Temporary changes to Instructional Support Day as Cobb educators and staff are offered COVID-19 vaccinations:

To give all interested Cobb educators the chance to receive COVID-19 vaccinations, the Instructional Support Days were move from:

Wednesday, April 14th to Friday, April 16th
Wednesday, April 21st to Friday, April 23rd

School holidays:

  • First Day of School – August 3, 2020
  • First Day of School Postponed 2 weeks, opened virtual only on August 17, 2020
  • Labor Day – September 7, 2020
  • Fall Break – September 28 – October 2, 2020
  • Phase 1 – October 5, 2020
  • Phase 2 – October 19, 2020
  • Student Holiday/Staff Workday – November 3, 2020
  • Phase 3 – November 5, 2020
  • Thanksgiving Holidays – November 23 – 27, 2020
  • Winter Holidays –  December 21, 2020 to January 5, 2021
  • Martin Luther King Jr Day – January 18, 2021
  • Winter Break – February 15 – 19, 2021
  • Spring Break – April 5 – 9, 2021
  • Last Day of School – May 26, 2021

School Calendar Guidelines and Notes:
State law requires that students are in school 180 days or its equivalent. Each year, school districts are given four “emergency days” they can use for a variety of purposes. Many districts have been building those days into their calendars.  In Cobb County, there are 178 days scheduled for students, and 188 days scheduled for teachers.  The first semester includes 88 school days and ends prior to Winter Holidays.  Second semester includes 90 school days, and ends prior to Memorial Day.  Fall Break begins on the fourth Monday in September.  Winter Break begins on the third Monday in February (Presidents Day).  Spring Break begins on the first Monday in April, providing consistency with other metro school systems.  The school year ends on a Wednesday to provide enough time to schedule graduation ceremonies.

Archived Calendar News:

All Cobb County schools will be virtual only for the week of January 19-22, 2021.

Tuesday, January 26 is a virtual only Instructional Support Day for all students due to PSAT and DNMQT’s taking place on Wednesday, January 27.  Wednesday, January 27 will be a regularly scheduled instruction day through in-person and virtual instruction.

To give all interested Cobb educators the chance to receive COVID-19 vaccinations, the Instructional Support Days will move from:

Wednesday, March 17th to Friday, March 19th
Wednesday, March 24th to Friday, March 26th

Cobb County School Calendars:
Cobb County School Calendar 2022-2023
Cobb County School Calendar 2021-2022
Cobb County School Calendar 2020-2021
Cobb County School Calendar 2019-2020
Cobb County School Calendar 2018-2019
Cobb County School Calendar 2017-2018

Marietta City School Calendars:
Marietta City School Calendar 2021-2022
Marietta City School Calendar 2020-2021
Marietta City School Calendar 2019-2020
Marietta City School Calendar 2018-2019
Marietta City School Calendar 2017-2018

Cobb County and Marietta City School Calendars
Cobb County Early Release Schedule
What day does Cobb County go back to school?
Cobb County and Marietta City Schools
List of Federal Holidays
Spring Break
Winter Break
Summer Camps
Private Schools


  1. When is Harrison High graduation scheduled next year in 2021? We will travel in and need to notify my employer now that I need to schedule time off.
    Thanks, Sandra White


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