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
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
October 1, 2026 – October 30, 2026
PSAT 8/9 — Fall
Testing window
October 1, 2026 – October 30, 2026
PSAT/NMSQT — Fall
Testing window
October 1, 2026 – October 30, 2026
SAT — School Day - Fall
Testing window
October 16, 2026
SAT — National
Score release