March 7 is St. Thomas's liturgical feast according to the pre-1969 General Roman Calendars. St. Thomas died on that date in 1274 at the abbey of Fossanova, where he had stopped after taking ill on his way with Reginald da Piperno to the second Council of Lyons.

January 28 is St. Thomas’s liturgical feast according to the General Roman Calendar of 1969. On that date in 1369 St. Thomas’s relics were translated to the Dominican church in Toulouse.