On January 9, 1908, President Theodore
Roosevelt declared the land a national monument,
the first to be created from land donated by a
private individual.

The star attraction of the Muir Woods is the Coast
Redwood (Sequoia sempervirens). These relatives
of the Giant Sequoia are known for their height.
While redwoods can grow to nearly 380 feet (115
m), the tallest tree in the Muir Woods is 258 feet
(79 m). Strangely, though, the trees come from a
seed no bigger than that of a tomato's. The
average age of the redwoods in the Monument are
between 500 and 800 years old with the oldest
being at least 1,200 years old.