Opening-week and final-day early dismissals
All students begin August 31 and dismiss early August 31–September 3. September 4 and September 7 are full Labor Day closures, with the weekend between them.
June 15 is the last school day, with early dismissal specifically for K–11. The calendar does not assign that shortened schedule to grade 12. UDHS graduation is June 14, and no separate senior final attendance date is supplied.
Source: Upper Darby School District 2026–2027 Year at a Glance Calendar — Updated April 25, 2026
November plans differ for kindergarten and older students
Kindergarten has no classes November 23–25. Grades 1–5 and middle school students attend shortened days November 23–24 for conferences. November 25 early dismissal applies to grades 1–12, while kindergarten remains off.
Elementary conferences are November 23 in the afternoon and evening, and November 24 in the afternoon. Middle school conferences are November 23 in the afternoon, and November 24 in the afternoon and evening. Keep conference appointments separate from pickup arrangements.
Source: Upper Darby School District 2026–2027 Year at a Glance Calendar — Updated April 25, 2026
Elementary PD / planning
These are individual early-dismissal school days. The comma-separated dates do not create a continuous break, and they do not change attendance at the other school levels.
Source: Upper Darby School District 2026–2027 Year at a Glance Calendar — Updated April 25, 2026
Middle school professional development
These are individual early-dismissal school days. The comma-separated dates do not create a continuous break, and they do not change attendance at the other school levels.
Source: Upper Darby School District 2026–2027 Year at a Glance Calendar — Updated April 25, 2026
Middle school planning
These are individual early-dismissal school days. The comma-separated dates do not create a continuous break, and they do not change attendance at the other school levels.
Source: Upper Darby School District 2026–2027 Year at a Glance Calendar — Updated April 25, 2026
High school professional development
These are individual early-dismissal school days. The comma-separated dates do not create a continuous break, and they do not change attendance at the other school levels.
Source: Upper Darby School District 2026–2027 Year at a Glance Calendar — Updated April 25, 2026
Keystone testing and asynchronous work
The calendar pairs Keystone testing with remote asynchronous work for students not assessed on January 5–7, May 17 and May 19–20. Students should follow the school’s assigned testing or learning schedule; these entries are not districtwide holidays.
May 18 is a full student closure between the May testing sessions. Keep it separate rather than extending testing or asynchronous instruction across the whole May 17–20 range.
Source: Upper Darby School District 2026–2027 Year at a Glance Calendar — Updated April 25, 2026
Sources and calendar review
This guide uses the district materials reviewed for our calendar record on November 12, 2026. The article publication date is separate from that source review. District notices may change the schedule; check the current downloads before making firm arrangements.
View all Upper Darby School District dates and source notes · Report a correction · How we review calendar information