How many islands are in the Thousand Islands region?

There are actually 1,864 islands in the Thousand Islands archipelago, straddling the Canada-US border along the St. Lawrence River. To be counted as an island, each must have at least two living trees and remain above water year-round.

What is the best time of year to visit the Thousand Islands?

The ideal time to visit is from late May through early October, with peak season being July and August. September offers fewer crowds, beautiful fall foliage, and still-warm waters perfect for boating and kayaking.

Do I need a passport to visit islands on the US side?

Yes, if your boat tour or private vessel visits islands on the American side or docks at Boldt Castle, you will need a valid passport or enhanced driver's license. Many Canadian cruises stay entirely on the Canadian side if you prefer to avoid border crossings.

Island Hopping 101: The Best Way to Explore the Thousand Islands

Island hopping in the Thousand Islands isn't just about snapping photos of castles (though Boldt Castle absolutely deserves a spot on any itinerary). This guide breaks down the smartest way to explore the archipelago—covering boat tours, private charters, and which islands you can actually set foot on. You'll skip the tourist traps, save money, and see spots most visitors miss entirely.

What's the Best Way to Tour the Thousand Islands?

The Gananoque Boat Line's Five Hour Lost Ships Cruise offers the best bang for your buck. You'll cruise through the Admiralty Group, slip past Millionaires' Row, and get a solid hour at Boldt Castle. That said, the two-hour Ivy Lea cruise works better if you're short on time. Uncle Sam Boat Tours out of Rockport, NY runs solid trips too—though you'll need a passport since their dock sits on the American side.

Tour Option	Duration	Best For	Price Range
Gananoque Boat Line (Lost Ships)	5 hours	First-timers, Boldt Castle	$55–$75 CAD
1000 Islands Kayaking	3–6 hours	Adventurous paddlers	$65–$125 CAD
Private charter (RiverQuest)	Custom	Groups, photography	$400+ CAD
Uncle Sam Boat Tours	1–3.5 hours	US-based travelers	$25–$50 USD

Which Islands Can You Actually Visit?

Only a handful. Boldt Castle on Heart Island tops the list—open daily May through October, admission runs around $12 USD. The catch? It's technically American territory, so bring proper ID. McDonald Island (also called Chimney Island) sits in Canadian waters and welcomes kayakers. Georgina Island hosts the 1000 Islands Tower for panoramic views, though many find the $15 admission steep for what's essentially an elevator ride. Here's the thing: most islands remain private. Those charming cottages? Someone's summer home. Respect the buoys—red markers mean stay out.

"The best islands aren't on the brochure. Locals know which rocky outcrops have the cleanest swimming holes—but you'll need a boat to find them."

How Much Does Island Hopping Cost?

Budget at least $150 CAD per person for a proper day on the water. Here's how that breaks down: boat tour ($60), Boldt Castle admission ($12 USD), lunch at the Boathouse Country Inn in Rockport ($35), and a few beers at the Ivy Lea Club ($25). Worth noting: bringing your own kayak cuts costs dramatically—launch from Brown's Bay Provincial Park for $12 day-use and paddle to McDonald Island free. Gas prices along the 401 corridor fluctuate wildly, so fill up in Kingston before heading east.

Sunset cruises depart around 6:30 PM from Gananoque during July and August. Book three days ahead—weekends sell out fast. The water stays cold well into June (think 60°F), so pack layers even when the air feels warm. And remember: cell service disappears between islands. Download offline maps or embrace the disconnection.