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OU Online
Graduate Summer 2025
Academic Calendars

Online Summer OL1: May 12 to August 15 (14 Weeks)

Event/Activity	Date
Application Deadline	April 28
Classes Start	May 12
Last day to add without the instructor’s permission	May 16
Last day to drop & receive 100% refund	May 23
Memorial Day Holiday: No Live Sessions	May 26
Juneteenth Holiday: No Live Sessions	June 19
Independence Day Holiday: No Live Sessions	July 4
Classes End	August 15
Grades Due	August 19

Online Summer OL2: May 12 to June 27 (7 Weeks)

Event/Activity	Date
Application Deadline	April 28
Classes Start	May 12
Last day to add without the instructor’s permission	May 13
Last day to drop & receive 100% refund	May16
Memorial Day Holiday: No Live Sessions	May 26
Juneteenth Holiday: No Live Sessions	June 19
Classes End	June 27
Grades Due	July 1

Online Summer OL3: June 30 to August 15 (7 Weeks)

Event/Activity	Date
Application Deadline	June 16
Classes Start	June 30
Last day to add without the instructor’s permission	July 2
Independence Day Holiday: No Live Sessions	July 4
Last day to drop & receive 100% refund	July 7
Classes End	August 15
Grades Due	August 19

Online Summer OL4: May 12 to July 3 (8 Weeks)

Event/Activity	Date
Application Deadline	April 28
Classes Start	May 12
Last day to add without the instructor’s permission	May 14
Last day to drop & receive 100% refund	May 16
Memorial Day Holiday: No Live Sessions	May 26
Juneteenth Holiday: No Live Sessions	June 19
Classes End	July 3
Grades Due	July 7

Online Summer OL5: May 12 to June 6 (4 Weeks)

Event/Activity	Date
Application Deadline	April 28
Classes Start	May 12
Last day to add without the instructor’s permission	May 13
Last day to drop & receive 100% refund	May 14
Memorial Day Holiday: No Live Sessions	May 26
Classes End	June 6
Grades Due	June 10

Online Summer OL6: June 9 to July 3 (4 Weeks)

Event/Activity	Date
Application Deadline	May 27
Classes Start	June 9
Last day to add without the instructor’s permission	June 10
Last day to drop & receive 100% refund	June 11
Juneteenth Holiday: No Live Sessions	June 19
Classes End	July 3
Grades Due	July 7

Online Summer OL7: July 7 to August 1 (4 Weeks)

Event/Activity	Date
Application Deadline	June 23
Classes Start	July 7
Last day to add without the instructor’s permission	July 8
Last day to drop & receive 100% refund	July 9
Classes End	August 1
Grades Due	August 5

Online Summer OL8: June 9 to August 1 (8 Weeks)

Event/Activity	Date
Application Deadline	May 27
Classes Start	June 9
Last day to add without the instructor’s permission	June 11
Last day to drop & receive 100% refund	June 13
Juneteenth Holiday: No Live Sessions	June 19
Independence Day Holiday: No Live Sessions	July 4
Classes End	August 1
Grades Due	August 5