A solemnity is one of the highest-ranking celebrations in the Roman calendar and marks a mystery of the Lord, the Blessed Virgin Mary, or a saint of major significance.
The liturgical color for this observance is White. Purity, joy, and major celebrations of the Lord and saints who are not martyrs.
Ordinary Time traces the public life and teaching of Christ in ordered weeks outside the major penitential and festal seasons.
1st week in Ordinary Time
Why this day matters
The Church contemplates the mystery of the Triune God—Father, Son, and Holy Spirit—in this Sunday solemnity.
Most Holy Trinity is observed on Sunday, May 31, 2026 in the Ordinary Time season. It is kept as a solemnity with the liturgical color White. The Church contemplates the mystery of the Triune God—Father, Son, and Holy Spirit—in this Sunday solemnity.