Upper Darby School District School Calendar 2026-2027

At a Glance

UDSD is a suburban school district with 14 schools. For the 2026-2027 school year, classes begin August 31 and end June 15. Upper Darby High School, established in 1895, is the oldest high school in Delaware County, PA, and was part of the inspiration for alumna Tina Fey's film Mean Girls. This calendar includes 4 professional development days, 60 early-release or half days — useful to know when planning childcare. Standardized testing windows: Standardized Testing Window (October 14); Standardized Testing Window (January 5–January 7); Standardized Testing Window (April 27–April 29); Standardized Testing Window (May 3–May 4); Standardized Testing Window (May 5–May 6); Standardized Testing Window (May 17); Standardized Testing Window (May 19–May 20).

Also known as UDSD.

Schools in Upper Darby School District

Primos El Sch (Elementary)
Upper Darby Kdg Ctr (Elementary)
Walter M Senkow El Sch (Elementary)
Aronimink El Sch (Elementary)
Bywood El Sch (Elementary)
Garrettford El Sch (Elementary)
Highland Park El Sch (Elementary)
Hillcrest El Sch (Elementary)
Stonehurst Hills El Sch (Elementary)
Westbrook Park El Sch (Elementary)
Beverly Hills MS (Middle)
Drexel Hill MS (Middle)
Upper Darby SHS (High)
Charles Kelly El Sch (Elementary)

Upper Darby School District 2026-2027 School Calendar

All schools

2026-07-03 — Observance of Independence Day - Schools/Offices Closed (closed)
2026-07-23 — Last Day of HS Summer School (in session)
2026-07-23 — Last Day of Summer Program (K-8) (in session)
2026-08-18 to 2026-08-20 — New Teacher Orientation (closed)
2026-08-25 — Teachers First Day (PD)/District Kickoff (closed)
2026-08-25 to 2026-08-28 — Professional Development (PD) (closed)
2026-08-31 — First Day of Schools (All Grades) (partial)
2026-08-31 — Early Dismissal - All District Students/PD (partial)
2026-09-01 to 2026-09-03 — Early Dismissal - All District Students/PD (partial)
2026-09-04 to 2026-09-07 — Labor Day - Schools/Offices Closed (closed)
2026-09-09 — Elem. Early Dismissal/PD (partial)
2026-09-10 — MS Early Dismissal/Planning Time (partial)
2026-09-17 — MS Early Dismissal/PD (partial)
2026-09-24 — MS Early Dismissal/Planning Time (partial)
2026-09-23 — HS Early Dismissal/PD (partial)
2026-10-01 — MS Early Dismissal/Planning Time (partial)
2026-10-07 — Elem. Early Dismissal/PD (partial)
2026-10-08 — MS Early Dismissal/Planning Time (partial)
2026-10-12 — Columbus/Indigenous Peoples' Day - Schools Closed (Offices Open) (closed)
2026-10-14 — PSAT Testing - Grades 10 & 11 (in session)
2026-10-15 — MS Early Dismissal/PD (partial)
2026-10-21 — HS Early Dismissal/PD (partial)
2026-10-22 — MS Early Dismissal/Planning Time (partial)
2026-10-29 — MS Early Dismissal/Planning Time (partial)
2026-11-03 — Election Day - No School for Students/PD (closed)
2026-11-04 — Elem. Early Dismissal/PD (partial)
2026-11-05 — MS Early Dismissal/Planning Time (partial)
2026-11-06 — MS/HS - End of Marking Period (in session)
2026-11-12 — MS Early Dismissal/PD (partial)
2026-11-18 — HS Early Dismissal/PD (partial)
2026-11-19 — MS Early Dismissal/Planning Time (partial)
2026-11-20 — KDG/Elem. - End of Trimester (in session)
2026-11-23 — Elem. Conferences (Afternoon & Evening) / MS Conferences (Afternoon) (partial)
2026-11-23 to 2026-11-24 — Elem./MS Early Dismissal (Conferences) (partial)
2026-11-23 to 2026-11-25 — KDG Conferences (No Students) (closed)
2026-11-24 — Elem. Conferences (Afternoon) / MS Conferences (Afternoon & Evening) (partial)
2026-11-25 — Early Dismissal (Grades 1-12) (All Staff) (partial)
2026-11-26 to 2026-11-27 — Thanksgiving Holiday - Schools/Offices Closed (closed)
2026-12-02 — Elem. Early Dismissal/PD (partial)
2026-12-03 — MS Early Dismissal/Planning Time (partial)
2026-12-04 — Elem. Early Dismissal/Planning Time (partial)
2026-12-09 — KDG/Elem. - Progress Reports Distribution (in session)
2026-12-10 — MS Early Dismissal/PD (partial)
2026-12-16 — HS Early Dismissal/PD (partial)
2026-12-17 — MS Early Dismissal/Planning Time (partial)
2026-12-24 to 2027-01-01 — Winter Break - Schools/Offices Closed (closed)
2027-01-04 — School Resumes for Staff & Students (in session)
2027-01-05 to 2027-01-07 — Keystone Testing (Remote asynchronous work for those not assessed) (in session)
2027-01-06 — Elem. Early Dismissal/PD (partial)
2027-01-07 — MS Early Dismissal/Planning Time (partial)
2027-01-14 — MS Early Dismissal/PD (partial)
2027-01-18 — Dr. MLK Holiday - Schools/Offices Closed (closed)
2027-01-19 to 2027-01-22 — UDHS Final Exams (in session)
2027-01-22 — MS/HS - End of Marking Period (in session)
2027-01-21 — MS Early Dismissal/Planning Time (partial)
2027-01-28 — MS Early Dismissal/Planning Time (partial)
2027-02-03 — Elem. Early Dismissal/PD (partial)
2027-02-04 — MS Early Dismissal/Planning Time (partial)
2027-02-11 — MS Early Dismissal/PD (partial)
2027-02-12 — No School for Students/PD (closed)
2027-02-15 — Presidents' Day - Schools/Offices Closed (closed)
2027-02-17 — HS Early Dismissal/PD (partial)
2027-02-18 — MS Early Dismissal/Planning Time (partial)
2027-02-26 — KDG/Elem. - End of Trimester (in session)
2027-02-25 — MS Early Dismissal/Planning Time (partial)
2027-03-03 — Elem. Early Dismissal/PD (partial)
2027-03-04 — MS Early Dismissal/Planning Time (partial)
2027-03-05 — Elem. Early Dismissal/Planning Time (partial)
2027-03-10 — KDG/Elem. - Progress Reports Distribution (in session)
2027-03-11 — MS Early Dismissal/PD (partial)
2027-03-17 — HS Early Dismissal/PD (partial)
2027-03-18 — MS Early Dismissal/Planning Time (partial)
2027-03-22 to 2027-03-26 — Spring Break - Schools/Offices Closed (closed)
2027-04-01 — MS Early Dismissal/Planning Time (partial)
2027-04-02 — MS/HS - End of Marking Period (in session)
2027-04-08 — MS Early Dismissal/Planning Time (partial)
2027-04-15 — MS Early Dismissal/Planning Time (partial)
2027-04-22 — MS Early Dismissal/Planning Time (partial)
2027-04-27 to 2027-04-29 — PSSA Testing Grades 3-8 (ELA) (in session)
2027-05-03 to 2027-05-04 — PSSA Testing Grades 3-8 (MATH) (in session)
2027-05-05 to 2027-05-06 — PSSA Testing Grades 5 and 8 (SCIENCE) (in session)
2027-05-12 — Elem. Early Dismissal/PD (partial)
2027-05-13 — MS Early Dismissal/Planning Time (partial)
2027-05-17 — Keystone Testing (Remote asynchronous work for those not assessed) (in session)
2027-05-18 — Primary Election - No School for Students/PD (closed)
2027-05-19 to 2027-05-20 — Keystone Testing (Remote asynchronous work for those not assessed) (in session)
2027-05-20 — MS Early Dismissal/PD (partial)
2027-05-26 — HS Early Dismissal/PD (partial)
2027-05-27 — MS Early Dismissal/Planning Time (partial)
2027-05-28 — No School for Students/PD (Contract In-service) (closed)
2027-05-31 — Memorial Day Holiday - Schools/Offices Closed (closed)
2027-06-03 — MS Early Dismissal/Planning Time (partial)
2027-06-04 — Elem. Early Dismissal/PD or Planning Time (partial)
2027-06-07 to 2027-06-11 — UDHS Final Exams (in session)
2027-06-10 — MS Early Dismissal/Planning Time (partial)
2027-06-14 — UDHS Graduation (in session)
2027-06-15 — KDG/Elem./MS/HS - End of Marking Period (in session)
2027-06-15 — Last Day of School for Students & Teachers/Early Dismissal K–11; MS Report Card/Elem./KDG Progress Report Distribution (partial)
2027-06-18 — Observance of Juneteenth - Schools/Offices Closed (closed)
2027-06-28 — First Day of Summer Program (GR K-12) (in session)