| Castleguard Mountain | |
| Other Name: | Mount Castleguard |
| Elevation M: | 3083 |
| Elevation Ref: | [1] |
| Prominence M: | 443 |
| Range: | Canadian Rockies |
| Parent Peak: | Mount Andromeda (3450 m) |
| Listing: | Mountains of Alberta |
| Location: | Alberta, Canada |
| Map: | Canada Alberta#Canada |
| Coordinates: | 52.1097°N -117.2539°W |
| Coordinates Ref: | [2] |
| First Ascent: | 1919 by the Interprovincial Boundary Commission |
Castleguard Mountain, also known as Mount Castleguard, is an isolated mountain located near the southern edge of the Columbia Icefield at the northern edge of Banff National Park in Alberta, Canada. In 1918, Irish land surveyor Arthur Oliver Wheeler named the mountain because of its castle-like appearance, which seemed to stand guard over the southern portion of the Columbia Icefield.[3] Castleguard was first ascended in 1919 by the Interprovincial Boundary Commission, which determined the exact location of the boundary between British Columbia and Alberta along the continental divide.[3]
Author Lewis Freeman, in his 1925 book Roof of the Rockies, described the view from the summit:
Castleguard is composed of sedimentary rock laid down during the Precambrian to Jurassic periods. Formed in shallow seas, this sedimentary rock was pushed east and over the top of younger rock during the Laramide orogeny.[4]
Based on the Köppen climate classification, Castleguard is located in a subarctic climate with cold, snowy winters, and mild summers.[5] Temperatures can drop below with wind chill factors below .