"Premier Group" was adopted 6 September 1927 by Order in Council, as arranged by British Columbia and the Geographic Board of Canada to mark the Diamond Jubilee of Confederation; the unnamed mountains in the group set aside to commemorate former prime ministers of Canada. The form of the name was changed to "Premier Range" 23 May 1962 on 83D, and it was agreed that those peaks over 10,000 feet would be named after deceased former Prime Ministers of Canada (file A.1.61).
For photographs and biographical information about all of Canada's Prime Ministers, see www.primeministers.ca; link also to "Canada's Prime Ministers" from Office of the Prime Minister homepage www.pm.gc.ca

Source: BC place name cards, or correspondence to/from BC's Chief Geographer or BC Geographical Names Office

Extending west from Robson Valley, CNR line and Yellowhead Highway.
North boundary: Kiwa Creek and headwaters of Raush River;
South boundary: headwaters branch of North Thompson River above Albreda River;
West boundary: Raush River, Ella Fry Creek and headwaters of North Thompson River.

Source: BC place name cards, or correspondence to/from BC's Chief Geographer or BC Geographical Names Office

Also on the same day, 6 September 1927, individual peaks in the Premier Group [sic] were designated Mount Sir Wilfrid Laurier, Mount Sir John Abbott, Mount Sir John Thompson and Mount Sir Mackenzie Bowell, after Canadian Prime Ministers, and Mount Stanley Baldwin, after the Prime Minister of England [sic] who had visited Canada that summer - the first British Prime Minister to visit Canada while in office. [mountains in the vicinity of Rogers Pass had been named in 1887 after Sir John A. Macdonald, Alexander Mackenzie, and Sir Charles Tupper, and a mountain near Terrace had been named Mount Sir Robert after Sir Robert Laird Borden, so it was decided not to designate additional peaks in the Premier Range after those former Prime Ministers.] Within the Premier Group, Mount John Oliver was named in 1928 after the premier of British Columbia who had died in office the previous year (ie. while the Premier Group designations were being planned). Mount Mackenzie King, Mount Richard Bennett and Mount Arthur Meighen were named in 1962; Mount Louis St-Laurent was named in 1964; Mount Lester Pearson was named in 1973; Mount Sir Allan MacNab was named in 1974. Mount Pierre Elliott Trudeau was named 10 June 2006. Mount John Diefenbaker was named 13 December 2006. [Note that Lake Diefenbaker had been named in Saskatchewan in July 1967, as requested by John Diefenbaker.]

Source: BC place name cards, or correspondence to/from BC's Chief Geographer or BC Geographical Names Office

There are 16 peaks above 9800 feet still unnamed in the Premier Range, of which 7 peaks exceed 10,000 feet. Other than the 1927 decision to name the highest peak (11,750 feet) after Sir Wilfrid Laurier, the relative elevation and location have not been considered when designating the peaks in this range. The mountain named after Mr. Trudeau was selected because of accessibility, offering non-technical climbing opportunities to a wide range of outdoor enthusiasts.

Source: BC place name cards, or correspondence to/from BC's Chief Geographer or BC Geographical Names Office