Walnut HighSchool Calendar
2025-26 Academic Calendar
Key dates, holidays, and events for Walnut High.
School at a Glance
Upcoming events & academic holidays2025-26 Academic Year
AUG
10
First Day of School
SEP
7
Labor Day
NOV
26
Thanksgiving Day
JAN
18
Martin Luther King Jr. Day
FEB
15
Presidents Day
MAY
27
Last Day of School
MAY
31
Memorial Day
JUN
18
Juneteenth
Partner 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 Walnut High.
National Tests
August 7, 2026
SAT — National
Registration deadline
August 11, 2026
SAT — National
Late registration deadline
August 14, 2026
ACT — National
Registration deadline
August 22, 2026
SAT — National
Test date
August 28, 2026
SAT — National
Registration deadline
September 1, 2026
ACT — National
Late registration deadline
State Assessments
March 1, 2027 – June 30, 2027
CAASPP — Statewide Window
Testing window
CA
School Milestones
October 1, 2026 – October 15, 2026
Private School Affidavit Filing Window
Other
CA