Jefferson County, New York
Wellesley Island State Park
State park
Wellesley Island State Park occupies the eastern end of Wellesley Island in the St. Lawrence River, with campgrounds, a marina, beaches and a nature center.
Why Visit
It is the largest state park in the Thousand Islands, with boating, camping and quiet river coves.
Amenities & Facilities
- Campgrounds and cabins
- Marina
- Beaches
- Nature center
Things to Do
- Camp on the island
- Boat the Thousand Islands
- Visit the nature center
- Swim at the beach
Best For
Boaters, campers and family vacations.
Parking & Visiting
Parking is available in designated lots. Fees, hours and seasonal closures change, so confirm current details with New York State Parks before visiting.
Nearby Communities
- Alexandria Bay
- Clayton
- Fineview
Related Attractions
- Thousand Islands
- Boldt Castle
- Clayton
- Alexandria Bay
Frequently Asked Questions
Can you camp at Wellesley Island?
Yes. The park has campgrounds and cabins; reserve through New York State Parks.
Seasonal Note
Trail conditions, beach staffing, boat rentals and road access change with the season. Confirm current hours and closures with the managing agency before you travel, especially in winter and early spring.
