Tallest tree living
Who
Hyperion, Sequoia sempervirens, Coast redwood
What
115.85 metre(s)
Where
United States ()
When
2009

The tallest tree currently living is Hyperion, which measured 115.85 metres (380 feet 1 inch) as of 2017. This coast redwood (Sequoia sempervirens) was discovered by Chris Atkins and Michael Taylor (both USA) in the Redwood National Park, California, USA, on 25 August 2006. The initial measurement read a height of 115.24 metres (378 feet). However, it was measured again by Dr Steve Sillett, Michael Taylor, Chris Atkins and Dr Robert Van Pelt in September 2006 by climbing it and dropping a tapeline, obtaining a height of 115.54 metres (379 feet 8 inches). Later measurements, such as those taken in 2009 and 2017, confirm that Hyperion is still active and growing.

Remarkably, Hyperion is situated on a hillside (not alluvial flat), 96% of the surrounding area of which has been logged of its original coast redwood growth. Atkins and Taylor had just earlier (1 July 2006) discovered two other coast redwoods in the same park, both of which also beat the previous holder, Stratosphere Giant. Their initial measurements concluded that: Helios measured 114.69 metres (376 feet 3 inches) and Icarus, 113.14 metres (371 feet 2 inches). However, in 2009 Helios's height was adjusted to 114.58 metres (375 feet 11 inches), with Icarus's height unchanged.

The exact location of Hyperion is kept in secret to limit visitors and protect the tree from damage.

Hyperion is estimated to be between 600 and 800 years old.