Heritage High SchoolSchool Calendar
2026-27 Academic Calendar
Key dates, holidays, and events for Heritage High School.
School at a Glance
Upcoming events & academic holidays2026-27 Academic Year
SEP
7
No School
Labor Day - No School
OCT
9
End of 9 Weeks
OCT
15
Parent/Teacher Conferences - Non-Student Day
NOV
23
No School
Thanksgiving Break
DEC
21
No School
Winter Break
JAN
18
No School
Martin Luther King Jr. Day
FEB
15
No School
Presidents' Day
MAR
22
No School
Spring Break
MAY
21
End of School - Early Release Elementary/Middle
MAY
22
High School Graduations
MAY
31
No School
Memorial Day
JUN
18
No School
Juneteenth
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 Heritage 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
State Assessments
January 11, 2027 – February 12, 2027
WIDA ACCESS
Testing window
CO
January 11, 2027 – February 12, 2027
WIDA Alternate ACCESS
Testing window
CO
April 5, 2027 – April 23, 2027
CMAS
Testing window
CO
April 5, 2027 – April 23, 2027
CoAlt
Testing window
CO