| Mount Lebanon | |
| Elevation Ft: | 5807 |
| Elevation Ref: | [1] |
| Prominence Ft: | 957 |
| Isolation Mi: | 1.82 |
| Isolation Ref: | [2] |
| Parent Peak: | East Butte (5,885 ft) |
| Country: | United States |
| State: | Montana |
| Region: | Liberty |
| Region Type: | County |
| Map: | Montana#USA |
| Relief: | 1 |
| Label Position: | bottom |
| Range: | Sweet Grass Hills |
| Coordinates: | 48.8681°N -111.0621°W |
| Topo: | USGS Mount Lebanon |
| Rock: | Igneous rock, Syenite |
| Age: | Eocene |
| Type: | Laccolith |
Mount Lebanon is a 5807abbr=offNaNabbr=off mountain summit in Liberty County, Montana, United States.[3]
Mount Lebanon is part of the Sweet Grass Hills and ranks as the fifth-highest peak in the range,[1] and fifth-highest in the county.[2] It is situated 26miles north of Chester, Montana, and 8miles south of the Canada–United States border. Precipitation runoff from the mountain drains into tributaries of the Milk River.[1] Topographic relief is modest as the summit rises over 1500abbr=offNaNabbr=off above the surrounding plains in one mile. The landform's toponym has been officially adopted by the United States Board on Geographic Names.[3]
Mount Lebanon is an exposed laccolith composed of diorite porphyry which was created by an igneous intrusion through older Cretaceous sedimentary rocks during the Eocene, about 50 million years ago.[4] Over time, erosion of the sedimentary rock has exposed the solidified laccolith which is more resistant to weathering.
Based on the Köppen climate classification, Mount Lebanon is located in a semi-arid climate zone with long, cold, dry winters and hot summers with cool nights.[5] [6] Winter temperatures can drop below −10 °F with wind chill factors below −30 °F.