It is situated on the British Columbia-Alberta border, as well as the Continental Divide, and the west boundary of Banff National Park.

The mountain's toponym was proposed in 1919 by Arthur Oliver Wheeler to commemorate the hamlet of St. Julien, Belgium, where Canadian troops gallantly fought the Battle of St. Julien in 1915 during World War I.

It also marked the first time a former colonial force (the 1st Canadian Division) defeated a European power (the German Empire) in Europe.

The toponym was officially adopted in 1920 when approved by the Geographical Names Board of Canada.

[6] St. Julien Mountain is composed of sedimentary rock laid down during the Precambrian to Jurassic periods.