Parks, Recreation and Historic Preservation

Mary Island State Park

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Access is by boat only, from either Dewolf Point State Park (2.5 miles over water), Grass Point State Park (4 miles over water), or Keewaydin State Park (2 miles over water).
1000 Islands, NY 13624
Latitude 44.365453068199997
Longitude -75.921706115999996

Mary Island State Park comprises 12 heavily-wooded acres with steep rocky outcroppings offering spectacular views of the Canadian shore or the shipping channel. Boats may be beached or moored near campsites. The park has a picnic area and several foot trails.

Access By Boat Only Boat rentals are available nearby, call the park for information.

Pet Policy: A maximum of two pets are allowed in campsites and day use areas unless prohibited by sign or directive. Pets are to be supervised at all times and either be crated or on a leash not more than 6-feet in length. Proof of rabies inoculation shall be produced if requested by staff. Pets are not permitted in playgrounds, buildings, golf courses, boardwalks, pools and spray-grounds or guarded beaches (this does not apply to service animals).

Mailing Address
c/o Wellesley Island State Park
44927 Cross Island Road Fineview, NY 13640

Hours of Operation

  • Open from Memorial Day weekend to Labor Day.
  • 2021 Camping Season: 5/28 - 9/5
  • 2021 Boat Dockage Season: 5/28 - 9/5

Fees & Rates

Most New York State Parks charge a vehicle use fee to enter the facility. Fees vary by location and season. A list of entry fees and other park use fees is available below. For fees not listed or to verify information, please contact the park directly.

The easy-to-use Empire Pass card is $80- and your key to all-season enjoyment with unlimited day-use entry at most facilities operated by State Parks and the State Dept. of Environmental Conservation including forests, beaches, trails and more. Purchase online or contact your favorite park for more information. Learn more about our Admission Programs including the Empire Pass.

  • Boat Dockage
  • Day Use $6
    Overnight $19 (prime)

    Weekend/Hol $4
    Out-of-State $5

  • Campsites
  • $19/night

    *Surcharges- $4 Weekend/Holidays, $5/night for non-NYS residents

  • Vehicle Entry
  • Day Use $6

    Toll Booth Hours:
    8:30AM to 3:30PM


Firewood source maps show a 50-mile radius from which untreated firewood may be moved to this campground. For more information see firewood restrictions.

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Amenities Information

  • Amenities
  • Campsites, Cabins & Lodging
  • Dockage
  • Fishing
  • Grills
  • Showers