Owasso High SchoolSchool Calendar
2025-26 Academic Calendar
Key dates, holidays, and events for Owasso High School.
School at a Glance
Upcoming events & academic holidays2025-26 Academic Year
SEP
7
Labor Day
OCT
15
Fall Break
NOV
23
Thanksgiving Break
DEC
18
Early dismissal or special event
DEC
21
Winter Break
MAY
19
End of school year events/graduation activities
MAY
22
End of school year events/graduation activities
MAY
25
End of school year events/graduation activities
MAY
27
End of school year events/graduation activities
Calendar TipEarly dismissal days and parent-teacher conferences are often updated 2 weeks in advance. Check back regularly to stay ahead of the schedule!
Standardized Test Dates
Upcoming national, state, and school calendar dates that affect students at Owasso High School.
National Tests
August 1, 2026 – November 30, 2026
ISEE — Fall Testing Season
Testing window
August 3, 2026 – June 30, 2027
SSAT — Flex Testing
Testing window
August 22, 2026
SAT — National
Test date
August 28, 2026
SAT — National
Registration deadline
September 1, 2026
ACT — National
Late registration deadline
September 1, 2026
SAT — National
Late registration deadline