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Better Education. Brighter Future.


  • TRINITY CATHOLIC HIGH SCHOOL: Better Education. Brighter Future

The offices at Trinity Catholic High School are now closed

The offices at Trinity Catholic High School are now closed permanently. For further assistance, including questions about transcripts or alumni information, please call the main office of the Archdiocese at 314-792-7000. No messages left on the phones at Trinity will be retrieved and no phones calls will be returned. Again, please call the Archdiocesan office at 314-792-7000 and someone will be happy to assist you.

Trinity Catholic High School logos

To all of our Families, Alums, and Friends,

On February 25, representatives of the Archdiocese of St. Louis announced the decision to close Trinity Catholic High School at the end of the current school year. This decision not only ends the 18-year history of Trinity Catholic, it also closes out over 70 years of excellence in Catholic education. Trinity Catholic was founded in 2003 to continue the legacy of its predecessor schools - Mercy (1948-1985), St. Thomas Aquinas (1954-1985), Rosary (1961-2003), and St. Thomas Aquinas-Mercy (1985-2003) High Schools.

For over seven decades these five schools have been educating young men and women in North St. Louis County and beyond. The Sisters of Mercy, the Sisters of St. Joseph, and the School Sisters of Notre Dame were instrumental in the formation of Mercy, St. Thomas Aquinas, and Rosary High Schools respectively. The care and devotion the sisters demonstrated back then continues today at Trinity Catholic.

Our thoughts and prayers are with our current students and families as well as our administration, faculty, and staff members during this difficult time. We also remember the Trinity Catholic alums and the alums of our predecessor schools. We certainly appreciate and understand your sense of loss. We could not have done what we have for the past 18 years without the help and support from all of you. We will be forever grateful.

As we move through the final few months of our school year, our goals are to help families and teachers make seamless transitions to new educational settings and to make the days and weeks ahead the best we can for all involved. While there will be sadness and tears, we don’t want to forget the joy. There is so much to celebrate and so much has been accomplished at Trinity Catholic and our predecessor schools.

In the areas of Faith, Academics, Athletics, Service, and Character our students have made a difference, and will continue to make a difference, in the world around them. The guidance given them by dedicated faculty and staff members has pointed them in the right direction and the legacy provided by our rich history and successful alums has been invaluable.

When the school year concludes in May and the doors are eventually shut for the final time, it will mark the end in many ways. What will never be erased, however, are the thoughts and memories all of us hold in our hearts and minds forever. Thousands of people will always share a common, unbreakable bond through Mercy, St. Thomas Aquinas, Rosary, St. Thomas Aquinas-Mercy, and Trinity Catholic High Schools.

Plans are being made for a final event that will allow all of us to come together, to celebrate and to remember. We will release more details about this event in the coming weeks. In the meantime, we will continue to pray for you and we ask that you continue to pray for us.

Dan Grumich - Aquinas - ‘82
Trinity Catholic High School

Good News at Trinity

$4.6 Million

Class of 2020 College Scholarships


Graduation Rate

75 Graduates

Class of 2020


Graduates to Date (includes alumni from Mercy, Rosary, Aquinas, Aquinas-Mercy and Trinity Catholic)

Trinity Calendar

Returning Families: The Re-Enrollment Deadline for the 2021-2022 school year is February 26th. Parents go to your Parent Portal and complete the re-enrollment process.