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Split Thumb
Split Thumb.jpg
Split Thumb, south aspect
Highest point
Elevation 5,523 ft (1,683 m)
Prominence 923 ft (281 m)
Isolation 2.15 mi (3.46 km)
Parent peak Mount Wrather
Split Thumb is located in Alaska
Split Thumb
Split Thumb
Location in Alaska
Location Tongass National Forest
Juneau Borough
Alaska, United States
Parent range Coast Mountains
Boundary Ranges
Juneau Icefield
Topo map USGS Juneau B-1
Type of rock granite
First ascent July 2, 1954
Easiest route class 5.4 Southeast arête

Split Thumb is a 5,523 ft (1,680 m) glaciated mountain summit located in the Boundary Ranges of the Coast Mountains, in the U.S. state of Alaska. The peak is situated near the southern periphery of the Juneau Icefield, 9 mi (14 km) northeast of Juneau, 2.15 mi (3 km) southeast of Nugget Mountain, and 4 mi (6 km) east of Heintzleman Ridge, on land managed by Tongass National Forest. Split Thumb is surrounded by the Lemon Creek Glacier to the west, and Norris Glacier to east. The Split Thumb Icefall is set on the east aspect of the peak. This peak's descriptive name was published in 1951 by the U.S. Geological Survey. The first ascent of Split Thumb was made July 2, 1954, by a Juneau Icefield Research Project party comprising Edward LaChapelle, Dick Hubley, Carlton Ray, Dr. Conrad Buettner, and Bob Goodwin.


Based on the Köppen climate classification, Split Thumb is located in a subarctic climate zone, with long, cold, snowy winters, and cool summers. Weather systems coming off the Gulf of Alaska are forced upwards by the Coast Mountains (orographic lift), causing heavy precipitation in the form of rainfall and snowfall. Temperatures can drop below −20 °C with wind chill factors below −30 °C. The month of July offers the most favorable weather to view or climb Split Thumb.

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