Despite the name, Castle Mountain Resort is not actually on Castle Mountain, which is about away within Banff National Park. The name is derived from the Castle Rivers, and the nearby Windsor Mountain. Windsor Mountain was originally named by the Blakiston group of the Palliser Expedition as Castle Mountain, within days of the naming of the Banff peak by the Palliser group of the Palliser Expedition. The name was changed to Windsor Mountain due to its shape and visible 'towers', which are still named as the Castle Peaks, which resemble Windsor Castle.