Father Harrington supported the efforts to establish a church presence in Robbinsdale, but insisted on it being self sustaining before he could endorse the idea and take it to the archbishop for approval. Thus the residents undertook many fund raising efforts and by 1910 they were in a position to locate and build a new church building in Robbinsdale. Father Harrington supervised the building project just as he had done with the school and church buildings at Ascension. A modest wood framed and white sided church with a bell tower was constructed on a corner of Robbinsdale’s main street (today West Broadway & 40 1/2th Ave). On Christmas Day 1911, Father Harrington said the first mass at the Church of the Sacred Heart in Robbinsdale.
As Sacred Heart in Robbinsdale was being established, a newly ordained priest (and future longtime pastor at Sacred Heart) Reverend Francis Nolan was assigned as an assistant to Father Hamngton at Ascension Parish. He and other assistant parish priests were initially directed by Father Harrington to travel to Robbinsdale to attend to the provision of the sacraments until a permanent pastor for the Robbinsdale church could be assigned. By mid-year 1912, Reverend William Blum was assigned as the resident pastor at Sacred Heart in Robbinsdale. In 1914, Father Harrington used the occasion of his 25th Anniversary of Ordination to make and address regarding the World War I. At a parochial assembly at Ascension, he reminded his flock that Germany was not alone at fault and that all the crowned heads in Europe were sending their men to slaughter. Father Harrington later served as a chaplain in the United States Army. He was for many years one of the best known members of the priesthood in Minneapolis. In November, 1924 Father Harrington passed away at St. Joseph’s Hospital in St. Paul. His body lay in state at Ascension. 160 priests and prelates joined thousands of parishioners in mourning. Archbishop Austin Dowling said in his tribute, “He was always a priest of this parish and you always knew where to find him. His whole heart and soul were wrapped up in the people of this district.”