Upcoming Events

Summer Camps 2025

Jul 14, 2025 9:00AM—Aug 29, 2025 12:00PM

Maker Faire Long Island, September 14th, 2025

Sep 14, 2025 10:00AM—5:00PM

Port Jefferson Harborfront

Open Play Hours – May 24th thr 25th

May 24, 2025 1:00PM—May 25, 2025 5:00PM

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

Open Play Hours – May 31st thr June 1st

May 31, 2025 1:00PM—Jun 01, 2025 5:00PM

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

First Mondays: Homeschool Families Exclusive at the LI Explorium 6-2-25

Jun 02, 2025 10:00AM—12:00PM

Our current General Hours are:

Saturday and Sunday: 1 PM – 5 PM
School Year Hours in effect starting September 2nd, 2024

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:

  • Martin Luther King Jr Day: Monday, 1/20/25.
  • Lunar New Year: Wednesday, 1/29/25.
  • February Break: Monday, 2/17/25 through Friday, 2/21/25.
  • Spring Break: Monday, 4/14/25 through Friday, 4/18/25.
  • Memorial Day: Monday, 5/26/25.
  • Juneteenth: Thursday, 6/19/25.

Closed Christmas Eve & Christmas Day

Additional dates to be added