Academic Calendars: Graduate Summer 2025 | OU Online

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 August 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
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