Central Islip has two courthouses on separate schedules. The Suffolk County (Cohalan) state complex clerk’s office runs Monday through Friday, 9:00 AM to 5:00 PM, with staff recommending arrival by 4:45 PM.1Suffolk County Clerk. Holiday Schedule – Section: Office Hours The federal courthouse operates weekdays as well, and the U.S. Bankruptcy Court clerk closes at 4:30 PM.2United States Bankruptcy Court. United States Bankruptcy Court Eastern District of New York – Central Islip The two systems keep different holiday calendars, so a day off at one may be a normal business day at the other. Central Islip court hours vary by which building and which division you need, and the fastest way to lose a day is to guess.
Suffolk County State Court Complex (Cohalan)
The John P. Cohalan Jr. Court Complex at 400 Carleton Avenue houses Suffolk County Supreme Court, County Court, Family Court, and District Court.3New York State Unified Court System. Mass Transit and Road Directions, Cohalan Court Complex The County Clerk’s office runs 9:00 AM to 5:00 PM weekdays, with a 4:45 PM cutoff for meaningful help before staff close their windows.1Suffolk County Clerk. Holiday Schedule – Section: Office Hours
Individual clerk’s offices inside the complex keep their own schedules by division. The Family Court General Clerk’s Office can be reached at 631-740-3800 for current hours and filing questions. The building opens before the windows do, giving you a few minutes to clear security before the judicial day begins. Call ahead to confirm your specific counter’s hours rather than assuming every division follows the same clock.
Alfonse M. D’Amato U.S. Courthouse (Federal)
The federal courthouse at 100 Federal Plaza handles cases in the U.S. District Court for the Eastern District of New York, covering federal criminal, civil, and bankruptcy matters.4Federal Judicial Center. Central Islip, New York (2000) The Eastern District publishes its official operating hours on its website.5United States District Court Eastern District of New York. Court Hours and Holidays
The U.S. Bankruptcy Court runs 9:00 AM to 4:30 PM at 290 Federal Plaza, a separate address within the same plaza.2United States Bankruptcy Court. United States Bankruptcy Court Eastern District of New York – Central Islip That 4:30 closing applies to the whole clerk’s office, not just in-person filings. Probation and Pretrial Services sits at 200 Federal Plaza, reachable at 631-712-6400.6Eastern District of New York. Central Islip Different federal offices occupy different buildings at Federal Plaza, so confirm the exact address for the office you need before you drive out.
Holiday Closures Where the Two Calendars Diverge
State and federal courts observe different holidays, and the mismatch is where most wasted trips happen. Lincoln’s Birthday and Election Day close the state courts but not the federal courthouse. The Day After Thanksgiving, Christmas Eve, and New Year’s Eve close the federal courthouse but not the state complex.
New York State Court Holidays (2026)
The Cohalan Complex will be closed on these dates in 2026:7New York State Unified Court System. 2026 UCS Calendar
- New Year’s Day
- Dr. Martin Luther King Jr. Day
- Lincoln’s Birthday
- Presidents’ Day
- Memorial Day
- Juneteenth
- Independence Day observed (Friday, July 3) and Independence Day (Saturday, July 4)
- Labor Day
- Columbus Day
- Election Day
- Veterans Day
- Thanksgiving
- Christmas Day
Federal Court Holidays (2026)
The Eastern District of New York will be closed on:8United States District Court Eastern District of New York. 2025-2026 Court Holidays
- New Year’s Day
- Martin Luther King Jr.’s Birthday
- Presidents’ Day
- Memorial Day
- Juneteenth National Independence Day
- Independence Day (observed Friday, July 3)
- Labor Day
- Columbus Day
- Veterans Day
- Thanksgiving
- Day After Thanksgiving
- Christmas Eve
- Christmas Day
- New Year’s Eve
When a federal holiday lands on a Saturday, the court closes the preceding Friday; a Sunday holiday shifts to the following Monday. That is why July 3, 2026 appears as the observed closure for Independence Day.5United States District Court Eastern District of New York. Court Hours and Holidays
Weather and Emergency Closures
A storm can shut one system while leaving the other open, so check both sources before you leave the house. For the Cohalan Complex, the New York State Courts website carries alerts, and the emergency recording line is 1-800-COURTNY (1-800-268-7869).9NYCOURTS.GOV. Emergency The state court system also offers text-message alerts about closures through its notification service.10New York State Unified Court System. General Questions, Suggestions and Court Information
For the federal courthouse, the Eastern District of New York website is the authoritative source for emergency alerts.5United States District Court Eastern District of New York. Court Hours and Holidays One system closing tells you nothing about the other.
Filing When the Windows Are Closed
Electronic filing extends your working day past the clerk’s schedule for the case types that support it. The Eastern District requires nearly all filings to go through the CM/ECF system, which accepts submissions 24 hours a day, seven days a week.11United States District Court Eastern District of New York. CM/ECF Users Guide If CM/ECF is down for more than an hour after noon on the day something is due, the deadline rolls to the next business day, but you have to file a declaration explaining your failed attempts.
On the state side, Suffolk County participates in NYSCEF for certain case types in Supreme Court and Surrogate’s Court.12New York State Unified Court System. E-Filing Family Court and District Court filings in Suffolk County generally still require in-person or mail submission, so window hours at the Cohalan Complex remain the deadline that matters for those matters.