Greendale HighSchool Calendar
2025-26 Academic Calendar
Key dates, holidays, and events for Greendale High.
School at a Glance
Upcoming events & academic holidays2025-26 Academic Year
AUG
24
Opening Day - Staff PD Week
AUG
26
Meet Your Teacher
OCT
2
PD AM / Data PM
NOV
3
PD AM / Data PM (Paraprofessional PD day)
NOV
24
Trimester 1 Ends
NOV
25
Conference Release Day
JAN
15
Semester 1 Ends
JAN
19
PD AM / Data PM
FEB
12
PD AM / Conference Release PM
MAR
5
Trimester 2 Ends
APR
23
PD AM / Data PM (Paraprofessional PD day)
MAY
28
PD AM / Data PM
JUN
10
Last Day of School (Half Day) / Trimester 3 Ends
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 Greendale 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 8, 2027 – April 16, 2027
PreACT Secure
Testing window
WI
March 9, 2027 – March 19, 2027
ACT with Writing — Test Window 1
Testing window
WI
March 23, 2027 – April 2, 2027
ACT with Writing — Test Window 2
Testing window
WI
April 6, 2027 – April 16, 2027
ACT with Writing — Test Window 3
Testing window
WI
School Milestones
October 15, 2026
Homeschool PI-1206 Form Due
Other
WI