2026-27 Academic Calendar
Key dates, holidays, and events for Mount Baker Senior High.
School at a Glance
Upcoming events & academic holidaysAUG
26
First Day of School
AUG
31
First Day Kindergarten
SEP
7
Labor Day (No School)
OCT
9
Staff Development (No School)
OCT
16
JH/HS Early Release, Conferences
NOV
3
Elementary Early Release, Conferences
NOV
11
Veterans Day (No School)
NOV
20
90 Min Early Release (Grade Prep)
NOV
25
Thanksgiving (No School)
DEC
21
Winter Break (No School)
JAN
1
Winter Break (No School)
JAN
18
Martin Luther King Jr. Day (No School)
JAN
22
Treaty Day (No School)
FEB
12
Staff Development (No School)
FEB
15
President's Day (No School)
FEB
16
Mid-Winter Break (No School)
MAR
5
90 Min Early Release (Grade Prep)
MAR
29
Inclement Weather Make-up Day
MAR
30
Elementary Early Release, Conferences
APR
5
Spring Break (No School)
MAY
7
Inclement Weather Make-up Day
MAY
28
Staff Development (No School)
MAY
31
Memorial Day (No School)
JUN
3
MBHS Graduation
JUN
11
Last Day of School and Early Release
JUN
14
Inclement Weather Make-up Day
JUN
18
Juneteenth (Observed) (holiday)
Standardized Test Dates
Upcoming national, state, and school calendar dates that affect students at Mount Baker Senior High.
National Tests
August 1, 2026 – November 30, 2026
ISEE — Fall Testing Season
August 3, 2026 – June 30, 2027
SSAT — Flex Testing
August 22, 2026
SAT — National
August 28, 2026
SAT — National
September 1, 2026
ACT — National
September 1, 2026
SAT — National
State Assessments
January 25, 2027 – April 30, 2027
WA-AIM
January 25, 2027 – March 19, 2027
WIDA ACCESS
January 25, 2027 – March 19, 2027
WIDA Alternate ACCESS
March 1, 2027 – June 25, 2027
Smarter Balanced — Online
April 5, 2027 – May 14, 2027
Smarter Balanced — Paper/Pencil