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Madison Boulder, Madison

#39 of 53 in Nature in White Mountains
Geologic Formation · Hidden Gem · Nature / Park
The Madison Boulder is one of the largest known glacial erratics in North America and among the largest in the world; it is preserved in the 17-acre (6.9 ha) Madison Boulder Natural Area in Madison, New Hampshire. The boulder is a huge granite rock measuring 83 feet (25 m) in length, 23 feet (7.0 m) in height above the ground, and 37 feet (11 m) in width. It weighs upwards of 5,000 tons. A part of the block is buried, probably to a depth of ten to twelve feet. It was acquired by the state from the Kennett family In 1946. In 1970, Madison Boulder was designated as a National Natural Landmark by the National Park Service.
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TripAdvisor traveler rating 4.5
43 reviews
  • A fascinating little side trip if you’re planning on driving The Kanc. At 4662 tons, 87 feet long and 37 feet high, to say this thing is huge is a tad underwhelming lol. There’s a little parking...  more »
  • This is one of those odd, fascinating, natural attractions that you will be happy to say you stopped and took it in. Short drive down a dirt road, followed by a short, easy 10 minute walk to the...  more »

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