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Mass

St. ThomasMonthly all-school Mass, plus Holy Days of Obligation (Weekly opportunities for Mass, Confession, Adoration and Rosary in addition)
St. Catherine'sMonthly (School-wide statement (all levels attend monthly); no high-school-specific schedule published. Daily student-led communal prayer; weekly Atrium (Catechesis of the Good Shepherd).)
CathedralDaily — Mass for the whole school every day (Anglican-patrimony liturgy; regular Evensong and Lessons & Carols alongside.)

Religious Tradition

St. ThomasBasilian Fathers — founded 1900. The school describes itself as the oldest college-preparatory high school for young men in Texas.
St. Catherine'sFounded 1966 by Dominican Sisters; independent Catholic with Dominican charism; Catechesis of the Good Shepherd; HS theology aligned with the Archdiocese
CathedralPersonal Ordinariate of the Chair of St. Peter (Bishop Lopes) — Anglican-patrimony Catholic liturgy: daily Mass for the whole school, regular Evensong, Lessons & Carols. Open to all students, not only Ordinariate members. Liturgies are held at the Cathedral of Our Lady of Walsingham.

Retreats

St. ThomasCamp Aquinas freshman retreat; grade-level retreats; dedicated Director of Retreats. Basilian motto: "Teach me Goodness, Discipline, and Knowledge"
St. Catherine'sNot Published
CathedralFreshman Retreat; Newman Retreat; House system (Benedict, Neri, Barbieri, De Sales)

Service Program

St. Thomas"Champions for Change" — six service experiences annually (service year Jun 1 - May 31)
St. Catherine'sService-learning with 54 partner organizations (Houston Food Bank, Catholic Charities, Houston Zoo); HS community service trips and retreats (no published hour requirement)
CathedralNot Published

Daily Mass

Commute from home

	St. Thomas High School	St. Catherine's Montessori	Cathedral High School
Tuition	$27,900 2026-27 rate	$20,560 2026-27 rate · 9th grade; grades 10-12: $20,753	$22,850 2026-27 rate
What's included	Included in tuition see list Laptop & technology Charged separately: Application fee: $75 Registration fee: $700 Camp Aquinas (freshman retreat): $650 (freshmen) Class retreat: $325 (returning/transfer students) Books: $550 Athletics fee: $250 (per sport) — optional AP exam: $99 (per course) — optional	Fees listed separately see fees Application fee: $150 Tuition deposit: $750 New Student Fee: $850 Facility fee: $800 Program fee: $2,500–$2,750	Fees listed separately No itemized fees published.
Sibling discount	$2,000/yr per sibling after the first	10% off for each younger sibling	Not Published
Lower school on campus	HS only	Yes 14 months–12th (Montessori)	HS only
Open house	Dec 6, 2026	Not posted	Nov 7, 2026
Required test	ISEE Offered on campus: Nov 14, 2026 · Jan 9, 2027	None	ISEE (or CLT for classical-school students)
Application deadline	Jan 15, 2027	Jan 15, 2027	Jan 15, 2027
Decision date	Mar 5, 2027	Mar 5, 2027	Not posted
Financial aid	Need-based + Merit	Need-based	Need-based + Merit
AP courses	21	Not posted	Not posted
Enrollment	791	23	Not Published
Student:Teacher	9:1	14.4:1	Not Published
Mass	Monthly	Monthly	Daily
Sports	12 sports	6 sports	11 sports
Links	Full profile Admissions	Full profile Admissions	Full profile Admissions

“Not posted” means the school hasn’t published it yet for this admissions cycle — check each school’s full profile for sources.