Upcoming Events

First Mondays at the Long Island Explorium – November 3rd, 2025

Nov 03, 2025 10:00AM—12:00PM

Long Island Explorium 101 East Broadway Port Jefferson, NY 11777

Open Play Hours – Oct 11th – 12th

Oct 11, 2025 1:00PM—Oct 12, 2025 5:00PM

Long Island Explorium Port Jeff Harbor 101 East Broadway Port Jefferson, NY 11777

Open Play Hours – SCHOOL HOLIDAY- Oct 13th

Oct 13, 2025 1:00PM—5:00PM

Long Island Explorium Port Jeff Harbor 101 East Broadway Port Jefferson, NY 11777

Discovery Days at the Long Island Explorium – October 13, 2025

Oct 13, 2025 9:00AM—3:00PM

Long Island Explorium 101 East Broadway Port Jefferson, NY 11777

Open Play Hours – Oct 18th-19th

Oct 18, 2025 1:00PM—Oct 19, 2025 5:00PM

Long Island Explorium Port Jeff Harbor 101 East Broadway Port Jefferson, NY 11777

Open Play Hours – SCHOOL HOLIDAY- Oct 20th

Oct 20, 2025 1:00PM—5:00PM

Long Island Explorium Port Jeff Harbor 101 East Broadway Port Jefferson, NY 11777

STEM-oween Spectacular at the Long Island Explorium – October 24, 2025

Oct 24, 2025 5:30PM—7:30PM

Long Island Explorium 101 East Broadway Port Jefferson, NY 11777

Our current General Hours are:

Saturday and Sunday: 1 PM – 5 PM
School Year Hours in effect starting September 2nd, 2025

Additional hours during special events, school breaks, and holidays as noted. See our Calendar of Events page for upcoming events

Stay informed by signing up for our newsletter and following us on social media.

For more details, including a virtual tour, map, and additional information, visit our Visit Us Page.

Monday through Friday:
Closed
Saturday:
1:00 PM - 5:00 PM
Sunday:
1:00 PM - 5:00 PM

In addition to our regular hours, we will be OPEN:

  • Columbus Day:  Monday, 10/13/25
  • Diwali:  Monday, 10/20/25
  • Veterans Day:  Tuesday, 11/11/25
  • Thanksgiving: Wednesday, 11/26/25 &Friday, 11/28/25

Closed Christmas Eve, Christmas Day, & New Year's Day

Additional dates to be added