What to do in Jefferson County, NY

Activities, attractions and tours

A historic stone castle on a lakeside island with a clear sky.
A stone castle with towers on a lakeside island, surrounded by trees and a larger building in the background.
A stone castle with multiple towers by a calm lake, surrounded by lush greenery and a partly cloudy sky.
A historic mansion with a red roof and stone towers by a lake.
A stone structure with a statue on top by a waterfront.

Things to do

Kingston Shipwreck Cruise

Kingston Shipwreck Cruise

£28
per adult
Kingston Shipwreck Cruise
See all activities in Jefferson County

What to do in Jefferson County

Stay near popular Jefferson County attractions

A historic stone castle on a lakeside island with a clear sky.

Boldt Castle

9.4/10 (1,063 reviews)
After visiting Boldt Castle, make a plan to see the other sights and activities in Alexandria Bay. Amble around the area's riverfront or seek out the local tours.
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Day trip destinations from Jefferson County

A historic stone castle on a lakeside island with a clear sky.

Alexandria Bay

Clayton, NY, USA - 02-09-2025: Winter aerial image Clayton, NY along a frozen St Lawrence River

Clayton

A serene lake surrounded by dense green trees and a small wooden cabin on a dock.

Lansdowne

A calm lake with trees reflecting sunlight, a small boat, and a house with a green roof by the water's edge.

Prince Edward