| Union Mountain | |
| Elevation Ft: | 7601 |
| Elevation Ref: | [1] |
| Prominence Ft: | 701 |
| Isolation Mi: | 1.87 |
| Parent Peak: | Capitol Mountain (7,868 ft) |
| Location: | Flathead County, Montana, U.S. |
| Map: | Montana#USA |
| Relief: | 1 |
| Label Position: | right |
| Range: | Rocky Mountains Flathead Range |
| Coordinates: | 48.0557°N -113.2782°W |
| Topo: | USGS Capitol Mountain |
| Rock: | Sedimentary rock |
| Age: | Precambrian |
Union Mountain is a 7601abbr=offNaNabbr=off summit located in Flathead County of the U.S. state of Montana.[2]
Union Mountain is located in the Flathead Range, a subset of the Rocky Mountains. It is situated in the Great Bear Wilderness, on land managed by Flathead National Forest. Schafer Meadows, Shafer Ranger Station, and the Schafer landing strip are set below the mountain's northeast base. The landing strip was grandfathered with the wilderness designation. The landing strip provides access for hikers, hunters, and river rafters. Precipitation runoff from the mountain drains north to the Middle Fork Flathead River, and topographic relief is significant as the summit rises 2800abbr=offNaNabbr=off above the river in approximately 1.5 mile. The nearest higher neighbor is Capitol Mountain, 1.9miles to the west-southwest.
Based on the Köppen climate classification, Union Mountain is located in a subarctic climate zone characterized by long, usually very cold winters, and short, cool to mild summers.[3] Winter temperatures can drop below −10 °F with wind chill factors below −30 °F.
Union Mountain is composed of sedimentary rock laid down during the Precambrian to Jurassic periods. Formed in shallow seas, this sedimentary rock was initially uplifted beginning 170 million years ago when the Lewis Overthrust fault pushed an enormous slab of precambrian rocks 31NaN1 thick, 50miles wide and 160miles long over younger rock of the cretaceous period.[4]