Boldt Castle Hours of Operation:
Open daily from Mother’s Day weekend through Columbus Day
10:30 AM – 6:30 PM
Special Holiday Hours:
Boldt Castle will remain open until 7:30 PM on Independence Day Weekend
Visiting Boldt Castle & Heart Island:
Any of our daytime tours offer an optional stop at Boldt Castle at the end of the cruise.
- Purchase admission tickets in advance on our website or on Boldt Castle’s official site.
- If you’re unsure when booking your boat tour, you can choose to disembark at the castle and purchase admission at the ticket booth on Heart Island.
Important:
Boldt Castle is operated by the Thousand Islands Bridge Authority and charges a separate admission fee, not included in Uncle Sam Boat Tours rates.
Please note: Our shuttle will not bring new visitors to Heart Island 1.5 hours before Boldt Castle’s closing time.
Click here for more information about shuttle service too and from Boldt Castle
Click here for information about the history of Boldt Castle
Boldt Castle Rates:
(In addition to Uncle Sam Tour/Cruise Rates)
- Adult (13+ years): $13.50
- Child (5–12 years): $9.50
- Infant (4 years and under): Free
(Prices in U.S. Funds)
Please Note:
No pets allowed on Heart Island or the Boldt Yacht House (except registered service animals)
No discounts for military or seniors