| Hellroaring Mountain | |
| Elevation Ft: | 8374 |
| Elevation Ref: | [1] |
| Prominence Ft: | 439 |
| Isolation Mi: | 1.24 |
| Isolation Ref: | [2] |
| Etymology: | Hellroaring Creek[3] |
| Map: | Montana#USA |
| Map Size: | 270 |
| Label Position: | top |
| Country: | United States |
| State: | Montana |
| Region: | Park |
| Region Type: | County |
| Part Type: | Protected area |
| Part: | Yellowstone National Park |
| Range: | Absaroka Range Rocky Mountains |
| Coordinates: | 45.0029°N -110.4444°W |
| Coordinates Ref: | [4] |
| Topo: | USGS Specimen Creek |
| Rock: | Gneiss, Schist, Granite[5] |
| Age: | Precambrian |
Hellroaring Mountain is an 8374abbr=offNaNabbr=off summit in Park County, Montana, United States.
Hellroaring Mountain is located in the Absaroka Range which is a subrange of the Rocky Mountains.[1] It is set within Yellowstone National Park,[2] with the summit in Montana and the lower south slope in Wyoming. Precipitation runoff from the mountain's slopes drains into Hellroaring Creek which is a tributary of the Yellowstone River. Topographic relief is significant as the summit rises 2200abbr=offNaNabbr=off above the creek in 0.6miles and 2750abbr=offNaNabbr=off above the river in 2.3miles. The mountain is composed of Precambrian gneiss, granite, and schist.[5] [6] This rock is an anomaly in Yellowstone Park and is significantly older than the volcanic rock that is common in the park.[7] Hellroaring Mountain is the largest outcropping of granite in the park, and the 2.7-billion years old rock is some of the oldest exposed rock in the world.[7] The mountain is located at the bend of Hellroaring Creek and was so named by prospectors in 1867.[4] The mountain's toponym was officially adopted as Hell Roaring Mountain in 1930 by the United States Board on Geographic Names, then officially amended to Hellroaring Mountain in 1965.[4] [8] However, it did appear in publications as Hellroaring Mountain as early as 1891,[9] and was recorded as '"Hell-Roaring Mountain" by Ferdinand Vandeveer Hayden in 1872.[10] The Hellroaring Fire burned thousands of acres near the mountain during the Yellowstone fires of 1988.[11]
Based on the Köppen climate classification, Hellroaring Mountain is located in a subarctic climate zone characterized by long, usually very cold winters, and mild summers.[12] Winter temperatures can drop below 0 °F with wind chill factors below −10 °F.