According to Wikipedia, Calgary is situated " in an area of foothills and prairie, approximately 80 km (50 mi) east of the front ranges of the Canadian Rockies" (i.e. 43 nm).
And also: "The Canadian Rockies have numerous high peaks and ranges, such as Mount Robson (3,954 m (12,972 ft)) and Mount Columbia (3,747 m (12,293 ft))."
If your planned route is over the Rockies, won't you be 'looking at' those in preflight planning?