The Cathedral was officially opened and consectrated on July 8, 1962 by the Primate of the Ukrainian Orthodox Church of Canada, Metropolitan Ilarion (Ohienko). The icon-screen of Iconostasis was installed in 1974, and the mosaic depicting the Holy Trinity, at the front of the Cathedral, facing Main Street was installed for the Millennium of Ukrainian Orthodoxy (1988), and was blessed by Metropolitan Wasyly.

As a 50th Anniversary project, stained glass windows were installed and icons were painted inside the sanctuary.