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Alton · Boat access only · The highest island on the lake

Rattlesnake Island

Rattlesnake Island is the long, steep ridge you see rising out of the water at the southeastern end of Lake Winnipesaukee, about 368 acres in the town of Alton, two miles from end to end with roughly five miles of shoreline. It is the highest island on the lake, standing something like 370 to 390 feet above the water, and its rocky east face drops straight into The Broads.

Alton
Town
22
Sales, last 5 years
$564,790
Typical home sale
5
On the market now

It is also the most active island market on Winnipesaukee. More property has changed hands here than on any other island in the lake, and there is usually something available, which is not true anywhere else out there. Part of that is simply size, and part of it is that the island is organized: the Rattlesnake Island Association has run things since 1969 and owns two mainland parcels in West Alton, so members get dedicated parking, a private launch ramp, docks, and gated trailer storage instead of going out to arrange all of it themselves.

Most of the homes ring the shoreline. The high wooded spine down the middle is conservation land and is going to stay that way, so what you are buying is a waterfront camp with a protected forest at your back.

The Snakes Were Real

The name is not a shape on a map. The Lake Winnipesaukee Historical Society is plain that the island was named for the timber rattlesnakes that lived on it, and Paul Blaisdell's 1975 history preserved firsthand recollections from people who remembered them: snakes from the island displayed during Weirs Reunion Week, boaters watching them bask on the eastern ledges, and lumbermen bitten while working the island. At one point people set the island on fire to be rid of them. It did not work. The snakes went deep into the cracks in the ledges, waited out the burn, and came back out. No confirmed population survives today, though nobody recorded when the last of them went.

The island turns up in the written record early. On February 1, 1788, surveyors resolving the long-running Masonian boundary dispute ran their line from Gilmanton, straight over Rattlesnake Island, and across the lake into Wolfeboro. They used it as a fixed landmark, which tells you the name was already settled more than 225 years ago. By 1871 a painting titled Rattlesnake Island, Winnepiseogee was on offer at a Boston auction house, so the place was being sold as New Hampshire scenery well before anyone summered there.

The virgin pine came off in 1915, which is the era those lumbermen were working. Some of the island's old timber had already gone into a building you can still walk into: the Libby Museum in Wolfeboro, put up between about 1908 and 1912 by local workmen using wood felled on Rattlesnake. The dates do not line up with the 1915 cut, so the museum came from earlier harvesting, but either way a piece of this island is standing on Route 109 today.

Drawn from Lake Winnipesaukee Historical Society records, Paul Blaisdell's "Three Centuries on Winnipesaukee" (1975), the History of Carroll County, and the Libby Museum's National Register history. The story that Native people placed the snakes there to guard valuables is local legend, and we treat it as such.

Read the full story of Rattlesnake Island
MLS Listings · Updated Daily

For Sale on Rattlesnake Island

Hover a marker for the listing, or tap on a phone. Use the Depth toggle to see the water around Rattlesnake Island.

The MLS record shows 88 sales on Rattlesnake Island, 22 in the last five years, with recent home sales averaging $564,790. You can also search Rattlesnake Island in the full listings browse.

Sold · Last 5 Years

Recently Sold on Rattlesnake Island

Islands trade rarely enough that what has actually sold tells you more than what happens to be listed today. These are the recorded sales on Rattlesnake Island over the last 5 years, newest first, at their closing prices.

178 Rattlesnake Island
Sold Jun 2026
Lake Winnipesaukee
54 views
$700,000$730,000

178 Rattlesnake Island

Alton, NH 03810

3 BD | 1 BA | 694 sqft | 0.65 acres

Listing by Maxfield Real Estate/Wolfeboro · Jen McCullough
Sold by Coldwell Banker Realty Bedford NH

630 Rattlesnake Island
Sold Jun 2026
Lake Winnipesaukee
49 views
$550,000$590,000

630 Rattlesnake Island

Alton, NH 03810

3 BD | 1 BA | 1,810 sqft | 1.5 acres

Listing by Maxfield Real Estate/ Alton · Vanessa Saunders
Sold by KW Coastal and Lakes & Mountains Realty/Wolfeboro

230 Rattlesnake Island
Sold Nov 2025
Lake Winnipesaukee
54 views
$565,000$625,000

230 Rattlesnake Island

Alton, NH 03810

3 BD | 2 BA | 1,440 sqft | 0.69 acres

Listing by Maxfield Real Estate/Center Harbor · Mark Ashley
Sold by Maxfield Real Estate/Wolfeboro

972 Rattlesnake Island
Sold Oct 2025
Lake Winnipesaukee
55 views
$625,000$699,000

972 Rattlesnake Island

Alton, NH 03810

4 BD | 2 BA | 1,504 sqft | 0.8 acres

Listing by Maxfield Real Estate/Wolfeboro · Jen McCullough
Sold by BHHS Verani Wolfeboro

890 Rattlesnake Island
Sold Oct 2024
Lake Winnipesaukee
16 views
$230,000$250,000

890 Rattlesnake Island

Alton, NH 03810

0.79 acres

Listing by Coldwell Banker Realty Center Harbor NH · Sara Holland
Sold by BHHS Verani Belmont

448 Rattlesnake Island
Sold Sep 2024
Lake Winnipesaukee
40 views
$950,000$995,000

448 Rattlesnake Island

Alton, NH 03810

2 BD | 1 BA | 1,054 sqft | 0.71 acres

Listing by Maxfield Real Estate/Wolfeboro · Jen McCullough
Sold by KW Coastal and Lakes & Mountains Realty/Wolfeboro

902 Rattlesnake Island
Sold Sep 2024
Lake Winnipesaukee
39 views
$387,000$438,000

902 Rattlesnake Island

Alton, NH 03810

1 BD | 1 BA | 502 sqft | 0.78 acres

Listing by Maxfield Real Estate/Wolfeboro · Jen McCullough
Sold by Maxfield Real Estate/Wolfeboro

1020 Rattlesnake Island
Sold Aug 2024
Lake Winnipesaukee
40 views
$842,000$849,000

1020 Rattlesnake Island

Alton, NH 03810

2 BD | 1 BA | 1,213 sqft | 0.73 acres

Listing by Maxfield Real Estate/Wolfeboro · Jen McCullough
Sold by Maxfield Real Estate/Wolfeboro

164 Rattlesnake Island
Sold May 2024
Lake Winnipesaukee
40 views
$480,000$509,000

164 Rattlesnake Island

Alton, NH 03810

2 BD | 1 BA | 927 sqft | 0.69 acres

Listing by Maxfield Real Estate/Wolfeboro · Jen McCullough
Sold by Coldwell Banker Realty Center Harbor NH

904 Rattlesnake Island
Sold Nov 2023
Lake Winnipesaukee
38 views
$410,000$459,000

904 Rattlesnake Island

Alton, NH 03809

1 BD | 0 BA | 264 sqft | 0.74 acres

Listing by Maxfield Real Estate/Wolfeboro · Jen McCullough
Sold by Maxfield Real Estate/Wolfeboro

330 Rattlesnake Island
Sold Aug 2023
Lake Winnipesaukee
37 views
$523,791$538,000

330 Rattlesnake Island

Alton, NH 03809

1 BD | 0 BA | 482 sqft | 0.7 acres

Listing by Maxfield Real Estate/Wolfeboro · Jen McCullough
Sold by Maxfield Real Estate/Wolfeboro

812 Rattlesnake Island
Sold May 2023
Lake Winnipesaukee
17 views
$250,000

812 Rattlesnake Island

Alton, NH 03810

0.73 acres

Listing by Coldwell Banker Realty Center Harbor NH · Ellen Mulligan
Sold by Realty ONE Group NEST

Showing the 12 most recent of 22 sales in the last 5 years. Ask us for the full sales history on Rattlesnake Island, including what did not make it to the MLS.

PrimeMLS

IDX display courtesy of Yankee Pedlar Realtors, Wolfeboro NH.

PrimeMLS Listing Information displayed herein is deemed reliable but is not guaranteed accurate by PrimeMLS. This display of listings may or may not be the entire Compilation from the PrimeMLS database, and PrimeMLS does not guarantee the accuracy of such information. © PrimeMLS, Inc.

Listing brokers may report inaccurate data to michelle@yankeepedlarrealtors.com or call (603) 569-1000.

Getting There

The Rattlesnake Island Association owns two mainland parcels in West Alton, and between them they settle the question every island buyer eventually runs into. The Upper lot is at the corner of Route 11 and Rollins Road and includes a locked, gated trailer storage area. The Lower lot is waterfront, on Nowicki Point Road off Rollins Road, and is known as The Landing: a gated community launch ramp and docks used to move members and their guests to and from the island.

Weigh that carefully against other islands, because it is the difference most buyers underestimate. Everywhere else out here, where you leave the car, where you put the boat in, and where the trailer lives are three separate problems you solve yourself, usually through a marina slip that carries an annual cost and often a waiting list. On Rattlesnake they come with membership, on land the association owns.

Power reached the island by submarine cable, with telephone and eventually DSL following, so this is not an off-grid proposition. As anywhere out here, confirm what any individual property actually has before you offer, because it varies camp to camp.

The water off the east side is some of the deepest in the lake. Older Carroll County histories cited soundings past 200 feet, and the Historical Society puts it around 169 feet southeast of the island. The bottom falls away as steeply as the ledges rise, which is worth knowing for docking and for how exposed that side gets when The Broads kick up.

Looking for a slip or mooring on the mainland side? See boat slips, marinas, and launches.

Frequently Asked Questions

Because of actual rattlesnakes. The Lake Winnipesaukee Historical Society and Paul Blaisdell's 1975 history both record a real timber rattlesnake population, with firsthand accounts of snakes on the eastern ledges and lumbermen being bitten. There is no confirmed population today.

Size and organization. It is one of the largest islands on the lake with homes all along its shoreline, so there is simply more inventory, and the association gives owners mainland parking and boat access, which makes ownership more practical than on islands where every buyer solves that alone. It is the one island where something is usually available.

On a shoreline lot, subject to the same NH shoreland and septic rules as any waterfront build, with materials moving by barge. The interior is a different matter: the Lakes Region Conservation Trust holds 102 acres of the high wooded spine as the Rattlesnake Island Preserve, and the association holds more, so the middle of the island is not developable and is not going to be.

By boat, from the West Alton side. Association members use The Landing, the association's own gated launch ramp and docks on Nowicki Point Road off Rollins Road, with member parking there and at the Upper lot where Rollins Road meets Route 11. There is no bridge and no public landing on the island.

Yes, and it is one of the strongest practical arguments for buying here. The Rattlesnake Island Association owns two parcels in West Alton: an Upper lot at Route 11 and Rollins Road with locked, gated trailer storage, and a waterfront Lower lot on Nowicki Point Road known as The Landing, with the association's own gated launch ramp and docks for members and their guests. On most Winnipesaukee islands parking, a launch, and trailer storage are three things you arrange and pay for yourself.

Yes. Power came in by submarine cable under the lake, and telephone and DSL followed. What any particular camp has for power, water, and septic still needs checking property by property, which we walk buyers through.

No. It is a private residential island. The Lakes Region Conservation Trust preserve occupies the interior, but the island's private character limits casual access, so the honest answer is to enjoy the eastern face from the water. It is one of the most recognizable sights on the lake.

It spans a wider range than most islands, from modest seasonal camps up to substantial waterfront homes, and it tends to offer the more attainable end of the island market precisely because there is more of it. The live listings on this page show what is actually available and asking right now.

New to island buying? Start with our island guide and the NH buyer's guide.

Watching Rattlesnake Island?

Island sales often happen by word of mouth before they happen on the MLS. We have worked this lake from Wolfeboro since 1940. Tell us what you are looking for and we will keep you ahead of the listings.