Joliet Twp HSD 204 School Calendar 2026-2027

At a Glance

JTHS is a suburban school district with 4 schools. For the 2026-2027 school year, classes begin August 18 and end December 18. Joliet Township High School District 204 was established in 1899 and its flagship campus, Joliet Central High School, opened in 1901 — making it one of Illinois's oldest public high school districts. This calendar includes 16 early-release or half days — useful to know when planning childcare. Standardized testing windows: ACT Testing (April 15); Pre-ACT Testing (April 16).

Source: Joliet Twp HSD 204

Also known as JTHS.

Schools in Joliet Twp HSD 204

Joliet Central High School (High)
Joliet West High School (High)
Pathways Academy (High)
Will Co Detention Center 9-12 (High)

Joliet Twp HSD 204 2026-2027 School Calendar

All schools

2026-07-04 — Independence Day Holiday (closed)
2026-08-14 — Full Day Institute - No Classes (closed)
2026-08-17 — Full Day Institute - No Classes (closed)
2026-08-18 — First Day of Classes - 1st Semester (in session)
2026-08-26 — Joliet Central Open House 6:00 p.m. – 8:00 p.m. – Early Dismissal 1:15 p.m. (partial)
2026-08-26 — Joliet West Open House 6:00 p.m. – 8:00 p.m. – Early Dismissal 1:15 p.m. (partial)
2026-09-07 — Labor Day Holiday - No Classes (closed)
2026-09-10 — School Improvement Planning – Early Release – 11:45 Student Dismissal (partial)
2026-09-24 — School Improvement Planning – Early Release – 11:45 Student Dismissal (partial)
2026-10-08 — School Improvement Planning – Early Release – 11:45 Student Dismissal (partial)
2026-10-12 — Columbus Day – No Classes (closed)
2026-10-22 — Parent Teacher Conferences 4:00 p.m. – 7:00 p.m. – Early Dismissal 1:15 p.m. (partial)
2026-10-23 — Parent Teacher Conferences 9:00 a.m. – 3:00 p.m. – No Classes (closed)
2026-10-29 — School Improvement Planning – Early Release – 11:45 Student Dismissal (partial)
2026-11-03 — Non-Attendance Day (closed)
2026-11-11 — Veteran's Day - No Classes (closed)
2026-11-19 — School Improvement Planning – Early Release – 11:45 Student Dismissal (partial)
2026-11-25 to 2026-11-27 — Thanksgiving Holiday - No Classes (closed)
2026-12-10 — School Improvement Planning – Early Release – 11:45 Student Dismissal (partial)
2026-12-18 — Last Day of School for 1st Semester (in session)
2026-12-21 to 2027-01-01 — Winter Holiday - No Classes (closed)
2027-01-04 to 2027-01-05 — Full Day Teacher Institute - No Classes (closed)
2027-01-06 — First Day of Classes - 2nd Semester (in session)
2027-01-18 — Martin Luther King, Jr. Holiday - No Classes (closed)
2027-01-28 — School Improvement Planning – Early Release – 11:45 Student Dismissal (partial)
2027-02-11 — School Improvement Planning – Early Release – 11:45 Student Dismissal (partial)
2027-02-15 — President's Day - No Classes (closed)
2027-02-25 — School Improvement Planning – Early Release – 11:45 Student Dismissal (partial)
2027-03-01 — Casimir Pulaski Day – No Classes (closed)
2027-03-04 — Parent Teacher Conferences 4:00 p.m. – 7:00 p.m. – Early Dismissal 1:15 p.m. (partial)
2027-03-05 — Parent Teacher Conferences 9:00 a.m. – 3:00 p.m. – No Classes (closed)
2027-03-18 — School Improvement Planning – Early Release – 11:45 Student Dismissal (partial)
2027-03-26 — Spring Holiday – No Classes (closed)
2027-03-29 to 2027-04-02 — Spring Break – No Classes (closed)
2027-04-15 — ACT Testing (in session)
2027-04-16 — Pre-ACT Testing (9th and 10th graders) (in session)
2027-04-22 — School Improvement Planning – Early Release – 11:45 Student Dismissal (partial)
2027-05-06 — School Improvement Planning – Early Release – 11:45 Student Dismissal (partial)
2027-05-22 — Graduation (in session)
2027-05-28 — Last Day of School for 2nd Semester (in session)
2027-05-31 — Memorial Day – No Classes (closed)
2027-06-01 to 2027-06-07 — Emergency Make Up Day (closed)
2027-06-19 — Juneteenth (closed)