Confusingly enough, there are three HOLIDAY VILLAGE shopping centers in Montana. The first opened, in Great Falls, in November 1959.
Graphic from https://www.holidayvillagemall.com

The first stores in Missoula's HOLIDAY VILLAGE opened in December 1961.
Graphic from M-R-M Enterprises

The HOLIDAY VILLAGE in Havre was dedicated in November 1978.
Graphic from http://havreholidayvillage.com