The town of Allerston was settled between 1911 and 1918. Mass was celebrated in the school house until 1912. Through the influence of Fr. J. J. Bidault, OMI, the construction of a Church in Allerston was underway. Bishop Legal came in a procession of twenty boys on horseback to bless the new Church on July 31, 1912. In honor of the farming community, the church was named after St. Isidore, the patron saint of farmers. The priests were shared with the community in Lethbridge from 1910- 1921 and from Milk River, 1921 onwards. In 1976, there were concerns regarding the structural integrity of the building and it was relocated onto a new foundation.