| Hallett Peak | |
| Elevation Ft: | 12720. |
| Elevation Ref: | [1] [2] |
| Prominence Ft: | 733 |
| Prominence Ref: | [3] |
| Isolation Mi: | 1.97 |
| Location: | Continental Divide in Rocky Mountain National Park between Grand and Larimer counties, Colorado, U.S.[4] |
| Range: | Front Range |
| Etymology: | William L. Hallett |
| Map: | Colorado |
| Coordinates: | 40.3031°N -105.6859°W |
| Topo: | USGS 7.5' topographic map McHenrys Peak, Colorado |
| Easiest Route: | hike |
Hallett Peak (Arapaho: Bonoh'ooonoteyoo
Hallett Peak is on the Continental Divide, flanked by Flattop Mountain to the north and Otis Peak to the south. Just to its east lie Emerald Lake, Dream Lake, and Nymph Lake, access to which is usually from the Bear Lake Comfort Station.
The Northcutt-Carter Route of Hallett Peak is recognized in the historic climbing text Fifty Classic Climbs of North America.[5] Non-technical climbers may reach the summit of Hallett Peak by hiking up the Flattop Mountain Trail to its highpoint, then walking south along the ridgeline and ascending the peak over talus piles.
The mountain is named for William L. Hallett (1856–1947), an outstanding mountain climber and one of the founders of the Rocky Mountain Club.[6] Hallett arrived in the Estes Park area as a young MIT-trained engineer on vacation in 1878. He became enamored with the area and decided to remain, and became a rancher based in Loveland, Colorado.[7] The mountain's toponym was officially adopted in 1932 by the United States Board on Geographic Names.[4]
In the Arapaho language the mountain is named bonoh'ooonoteyoo' or Thunder Peak.[8]
According to the Köppen climate classification system, Hallett Peak is located in an alpine subarctic climate zone with cold, snowy winters, and cool to warm summers.[9] Due to its altitude, it receives precipitation all year, as snow in winter and as thunderstorms in summer, with a dry period in late spring.