Helios - World's 2nd Tallest Tree
Height: 377.13+ ft (114.95+ m) Elevation: GPS Latitude:
Volume: 21,420 ft3 (607 m3) Creek: Redwood Creek tributary GPS Longitude:
Width: 16.00 ft (4.88 m) Grove: Helios Grove Discovery Date: July 1, 2006
Age: 2,040 y Park: Redwood NP Discovered By: Chris K. Atkins
Michael W. Taylor

Notes: Helios is the world's 2nd tallest tree, the 2nd tallest and 5th largest (4th largest single-stem) tree in Redwood National Park, and the tallest and largest tree in Helios Grove. Naturalists Chris K. Atkins and Michael W. Taylor named the tree after the Greek Titan Helios, god of the sun and son of Hyperion, because its treetop remained sunlit when first spotted near sunset on July 1, 2006. Helios held the title of world's tallest tree until Atkins and Taylor discovered Hyperion in Redwood National Park on August 25, 2006.

At current average annual growth rates, Helios, 2.8 in/y (7.1 cm/y) since 2006, should not overtake Hyperion, 1.5 in/y (3.9 cm/y) since 2006, until 2042. Another faster-growing redwood, perhaps Paradox, 7.4 in/y (18.9 cm/y) since 1995, may pass Hyperion before then. Meanwhile, unless the relative growth rates of Hyperion, Helios, and Paradox change substantially, Helios may never again be the world's tallest tree.

Helios is the 10th fastest-growing redwood yet measured; it grew an average of 31.0 ft3 (0.88 m3) and 993 lb (450 kg) each year over a recent decade. Helios has the largest measured crown, 696,050 ft3 (19,710 m3), in Redwood National Park [3rd largest in Redwood National and State Parks behind Iluvatar, 915,500 ft3 (25,924 m3), and Atlas, 912,740 ft3 (25,846 m3)] and contains over 560 million leaves. The main trunk tapers sharply about 59 ft (18 m) above average ground level, and the tallest leader is a reiterated trunk.