I recall that Fort Chimo, Quebec, Cranbrook, B.C., and perhaps Castlegar, B.C., Canada, tied for North America's last LF four-course range certified IFR approaches. Juneau, Alaska also had a LF four-course approach, but I believe it was decommissioned before Canada's four-course range approaches. The reason: The LF ranges were all located in mountainous terrain in areas prone to marginal weather, and the LF courses were oriented over the least hazardous terrain, i.e. valleys, lakes and fjords.
I'll vote for Castlegar, B.C., for the last aerodrome having a certified LF four-course range approach in North America. I await rebuttal.