Castle Clinton National Monument
New York
Tonight
🌗 46% moon
6.3 h fully dark
Crowds
high
Open today
Open
Entrance
Free entry
Temporary Pause on Research and Donation Requests
Please be advised that due to staffing changes and the ongoing hiring freeze, there is a pause on research requests and donation considerations at all parks in the Manhattan Sites Unit until further notice. Please check this website and social media for updates.
Located at the southern tip of Manhattan, Castle Clinton marks the place where New York City began and reflects the growth of both the city and the nation. Built to defend the harbor during the War of 1812, it has since welcomed theatergoers, immigrants, and sightseers—and today continues to greet millions of visitors to New York Harbor.
Topics
No entrance fee.
Hours & seasons
Castle Clinton is open daily except Thanksgiving day and Christmas Day.
Generally open:
winterspringsummerfallHours are reported by the park — verify before you go.
📞 212-329-9979
✉ cacl_info@nps.govConditions
Quietest months (fewer crowds): Jan, Feb
Typical crowds: high
Weather now: ☀️ Clear, 85°F
🌦️ 90°/76°
🌦️ 91°/76°
☁️ 92°/73°
Typical monthly recreation visits · NPS avg 2023–2025 — orange months are the quietest by crowds.
Quietest months
Relative crowds by month — lighter is quieter; ringed months are the calmest by crowds.
Jan
33%
Feb
35%
Mar
55%
Apr
69%
May
68%
Jun
76%
Jul
100%
Aug
92%
Sep
56%
Oct
67%
Nov
49%
Dec
56%
Log a sky reading
Measured the sky with an SQM meter or app? Add your reading (16 = city glow … 22 = pristine). Opt in under “Travelers like you” to share it on the community leaderboard.
Visitor centers
Castle Clinton NM
Accessibility
Reported by the park — verify before you go.
Not an official safety source — always defer to NPS.gov and rangers for life-safety decisions.
By the numbers
A visual read on Castle Clinton National Monument — its character, trails, sky, and weather.
Park fingerprint
How this park scores across the dimensions travelers care about.
3-day forecast
Daily high and low temperatures (°F).
Places to see
Southwest Battery (Castle Clinton)
Audio & media
Learn more
Although many Irishmen were found throughout the Union, and to a lesser degree, Confederate forces, numerous specifically "Irish" regiments and companies enabled new immigrants to join comrades with a similar background. Most famous was the Irish Brigade of the Army of the Potomac, particularly distinguished for hard fighting at Antietam, Fredericksburg, and Gettysburg.
An overview of the volunteer program in Manhattan, New York City and instructions on how to apply for the program.
As part of the NPS "Your Park Story / My Park Story" initiative in 2023, Director Sams shares his own park story.
Plan Like a Park Ranger: Top Tips for Visiting the Manhattan Sites
How Castle Clinton National Monument connects
This park's activities, topics, location, and on-the-ground places — one hop in the graph. Drag to explore; click an activity, topic, or related park to follow it.
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