Liturgical Event

Lent is a time to follow Christ’s will more faithfully and focus on what truly matters in life. Join Assumption on Ash Wednesday, February 18, 2026, for 6:30AM, 8AM, or 7PM Mass, or the 12:05PM service in the Church. Together, let’s prepare our hearts for Easter. 

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Join us on this Holy Day of Obligation: Vigil Mass Wednesday, December 31 at 5:30 PM Morning Mass Thursday, January 1 at 8 AM and 10 AM The feast concludes the octave (eight-day) celebration of Christmas Day. On this day, the Church focuses on honoring Mary’s motherhood ...

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Blessings to you and your family this Advent Season. We can't wait to celebrate the birth of Christ with you and pray together in the new year to celebrate the Feast of the Solemnity of Mary, the Holy Mother of God! The liturgical season of Christmas begins with the vigil Masses on Chris...

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December 8th is the Feast of the Immaculate Conception and a holy day of obligation. The Immaculate Conception means that the Blessed Virgin Mary, whose conception was brought about the normal way, was conceived without original sin or its stain—that’s what "immaculate" mean...

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Assumption Parish in O'Fallon, MO, invites you to Mass  to celebrate the Solemnity of the Assumption of the Blessed Virgin Mary, a Holy Day of Obligation. Vigil Mass will be celebrated at 5:30PM, Thursday, Aug. 14, and at 6:30AM, 8AM and 7PM on Friday, Aug. 15 in the Church. The A...

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Parish Office Closed: On Friday, July 4th in observance of Independence Day. Morning Mass and Main Street Parade Closure: There is only one morning Mass at 8AM in the Chapel. If you are able to join us, please keep in mind that there may be restrictions on Main Street, as the City ...

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Assumption and St. Juan Diego Parishes are called to come together on the afternoon of Sunday, June 22, to celebrate The Solemnity of the Most Holy Body and Blood of Christ, also known as the Feast of Corpus Christi. Parishioners of all ages are invited to participate in a one-mile process...

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Starting Tuesday, May 27, after summer officially begins, our 6:30AM and 8AM weekday Masses, and 8AM Saturday Mass, will be held in the Chapel until Labor Day.  Weekday Confessions from 7:30-7:50AM also will be held in the Chapel during the summer months. Please join us!

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