Members Meeting (members only)

LOCATION

Visit Us:
Saturday Evenings
1115 Main Bayview Rd
Southold, New York 11971

Mailing address:
PO Box 1204
Southold, New York 11971

CUSTER INSTITUTE & OBSERVATORY

Is a 501(c) (3) New York State educational non-profit. It is the oldest public observatory on Long Island, established in 1927. The Institute operates on public support (proceeds from Saturday night sessions, events, dues, small donations, etc); it is not endowed, nor is it government-owned or sponsored. Please consider making a donation or showing your support by becoming a member.

HOURS

Saturday
8 pm-midnight

Memorial Day - Labor Day

7 pm in winter

QUICK LINKS

ABOUT US

EVENTS

WEATHER

RESOURCES

FAQ

CONTACT

631-765-2626

EMAIL US

BUSINESS LINKS

DONATE

Copyright Custer Institute Observatory 2025

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Special Thanks to Steven Bellavia for his photography.