The Castle Island Association (CIA), established in 1977, is a fantastic group of volunteers dedicated to preserving the spirit of Fort Independence. Since spring 1981, the CIA has offered guided tours that share the rich history of this important landmark. Because of their hard work, Fort Independence remains a beloved treasure in Boston.

The Association’s mission is to “…enhance and maintain the Castle Island facility and the Fort, a public space on Boston Harbor, while educating everyone about the historical importance of Castle Island and the Fort…” The volunteers at Castle Island bring a lot of enthusiasm and passion to their tours. Bill Spain, President of the Castle Island Association, generously shares his knowledge with every volunteer. He teaches them about the fascinating history of the fort and the island, making each visit truly special for you, the visitor.

Hours of Free Tours at Fort Independence for 2026

Here is schedule for tours and events in 2026

All events are very much weather-dependent.

In June, July, and August 2026, tours will be run between 12:00 and 3:00 on Saturdays and Sundays starting Memorial Day weekend. After the Labor Weekend, tours will run on Sundays only.

From May 28, the Thursday Twighlight Skyline Viewing did return at 7:00 PM to Dusk. This runs in June and July only.

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