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Cost & Financial Aid

Annual Tuition

  • St. Thomas2,790,000 (2026-27 rate)
  • St. Peter CTHS1,500,000 (2026-27 rate · most families pay far less after aid)
  • Duchesne3,360,000 (2026-27 rate · Upper School)

Need-Based Financial Aid

  • St. ThomasYes (~1/3 of students aided; $2.7M+/yr; awards 10-95% of tuition; Blackbaud; deadline Jan 15, 2027; awards mid-March)
  • St. Peter CTHSYes (95% of students aided (2025-26); approved TEFA provider (state accounts, from 2026-27))
  • DuchesneYes ($2M+ awarded annually to ~26% of students; Clarity portal)

Merit Scholarships

  • St. ThomasYes (Academic Scholarship Program (ISEE-based), Gabel Scholarship (80% tuition, ~2/yr), Basilian Fathers', Principal's/Aquinas scholarships (GPA-renewable). Sibling discount $2,000/yr after first.)
  • St. Peter CTHSNot Published
  • DuchesneYes ($15,000/yr renewable: Janet Erskine Stuart (Catholic middle-schoolers), Madeleine Sophie Barat (continuing Duchesne 8th), Rose Philippine Duchesne (incoming 9th, other schools))

Payment Plans

  • St. ThomasNot Published
  • St. Peter CTHSMonthly (10 payments Jul-Apr) · By semester (Jul / Jan) · Annual (Jul)
  • DuchesneFull (May 20) · 2-pay (May / Nov) · 12-month monthly

Aid Award Notification

  • St. ThomasNot Published
  • St. Peter CTHSNot Published
  • Duchesne2027-03-05 (Award acceptance Mar 24, 2027.)

Included in Tuition

  • St. ThomasLaptop & technology
  • St. Peter CTHSNot Published
  • DuchesneNot Published

Sibling Discount

  • St. Thomas$2,000/yr per sibling after the first
  • St. Peter CTHSNot Published
  • DuchesneNot Published
Commute from home
Tuition
$27,900

2026-27 rate

$15,000

2026-27 rate · most families pay far less after aid

$33,600

2026-27 rate · Upper School

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

No itemized fees published.

Fees listed separately see fees
  • New Student Fee: $1,500
  • Enrollment deposit: $1,000
  • Technology fee (Grade 9): $2,600
  • Textbooks: $350 (approximate, Upper School)
  • Grade 10 College Tour: $500 (grade 10)
  • Graduation fee: $600 (seniors)
  • Class trips: $175–$2,800 — optional
  • AP exams: $100–$200 (per exam) — optional
  • Athletics fee: $150–$300 (per sport) — optional
Sibling discount$2,000/yr per sibling after the firstNot PublishedNot Published
Lower school on campusHS onlyHS only
Yes

PK3–12

Open houseDec 6, 2026Not postedNov 1, 2026
Required test
ISEE

Offered on campus: Nov 14, 2026 · Jan 9, 2027

None
ISEE
Application deadlineJan 15, 2027Not postedNot posted
Decision dateMar 5, 2027Not postedNot posted
Financial aid
Need-based + Merit
Need-based
Need-based + Merit
AP courses21Not posted20
Enrollment79126300
Student:Teacher9:1Not Published8.1:1
Mass
Monthly
Monthly
Not Published
Sports12 sportsNot posted12 sports
Links

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