Grandjean Peak

Grandjean Peak
East aspect. Left to rightː 9144, 9180 East, 9120, 9180 West
Highest point
Elevation	9,180 ft (2,798 m) [1]
Prominence	680 ft (207 m) [1]
Parent peak	Tohobit Peak (10,046 ft) [2]
Isolation	2.51 mi (4.04 km) [2]
Listing	Peaks of the Sawtooth Range
Coordinates	44°06′59″N115°06′16″W / 44.1162705°N 115.1043478°W / 44.1162705; -115.1043478 [3]
Naming
Etymology	Emile Grandjean
Geography
Grandjean Peak Location in Idaho Show map of Idaho Grandjean Peak Grandjean Peak (the United States) Show map of the United States
Country	United States
State	Idaho
County	Boise
Protected area	Sawtooth Wilderness
Parent range	Sawtooth Range Rocky Mountains
Topo map	USGS Warbonnet Peak
Geology
Rock age	Eocene
Mountain type	Fault block
Rock type	Granite
Climbing
First ascent	1994 by Greg Parker [1]
Easiest route	class 4 [1] [2]

Grandjean Peak is a 9,180-foot-elevation (2,798-meter) mountain summit in Boise County, Idaho, United States.

Description

Grandjean Peak is part of the Sawtooth Range which is a subset of the Rocky Mountains. ^[4] This mountain with multiple high points is located 11 miles (18 km) southwest of Stanley, Idaho, in the Sawtooth Wilderness on land managed by Boise National Forest. Precipitation runoff from the mountain's slopes drains to the South Fork Payette River via Baron and Goat creeks. Topographic relief is significant as the summit rises 3,580 feet (1,090 meters) above Baron Creek in one mile (1.6 km) and 3,180 feet (970 meters) above Goat Creek in 0.85 mile (1.37 km).

Etymology

The mountain is named after Emile Grandjean (1861–1942), who served as the first supervisor of Boise National Forest from 1908 to 1922. ^[1] This landform's toponym has been officially adopted by the United States Board on Geographic Names. ^[3]

Emile Grandjean

Climate

Based on the Köppen climate classification, Grandjean Peak is located in an alpine subarctic climate zone with long, cold, snowy winters, and cool to warm summers. ^[5] Winter temperatures can drop below −10 °F with wind chill factors below −30 °F.

See also

• List of mountain peaks of Idaho
• Mountainsportal

References

1. "Idaho: A Climbing Guide, Grandjean Peak". idahoaclimbingguide.com. Retrieved September 18, 2023.
2. "Grandjean Peak - 9,180' ID". listsofjohn.com. Retrieved September 18, 2023.
3. "Grandjean Peak". Geographic Names Information System . United States Geological Survey, United States Department of the Interior . Retrieved September 18, 2023.
4. "Grandjean Peak, Idaho". Peakbagger.com. Retrieved September 18, 2023.
5. Peel, M.C.; Finlayson, B.L. & McMahon, T.A. (2007). "Updated world map of the Köppen-Geiger climate classification" (PDF). Hydrology and Earth System Sciences . 11 (5): 1633–1644. Bibcode:2007HESS...11.1633P. doi: 10.5194/hess-11-1633-2007 . Archived (PDF) from the original on December 2, 2019. Retrieved November 7, 2025.

External links

• Grandjean Peak: Idaho: A Climbing Guide
• Grandjean Peak: weather forecast