Trinity High School (Top-Ranked 草榴社区 School for 2026)

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Trinity High School

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Trinity High School, founded in 1918 by the Dominican Sisters of Sinsinawa Wisconsin, is a Catholic college-preparatory high school for young women.

Trinity has earned an excellent reputation as a premier high school with a strong commitment to educating young women and preparing them for the future: intellectually, spiritually, socially, and morally.

The school community guides young women in developing skills for lifelong learning, an ethnic of care and the desire for excellence.

Each student is recognized as unique. In a nurturing, catholic, college preparatory enviornment, she is encouraged to become self-directed toward responsible participation in the Christian community in order to impact society, Church and family in the twentyfirst century.

Quick Facts (2026)

Top-Ranked IL School
Grades: 9-12
Enrollment: 422 students
Yearly Tuition: $17,100
Average class size: 15 students
Application Deadline: None / Rolling
Source: Verified school update

Top Rankings

Trinity High School ranks among the top 20% of private schools in Illinois for:

School Overview

Religious Affiliation

Catholic

Grades Offered

Grades 9-12

Year Founded

1918

Colors

White, Navy Blue

Campus Size

small

Student Body

Total Students

422 students

Student Body Type

All-girls

% Students of Color

46%

State avg.: 34%

Students by Grade

Academics and Faculty

Total Classroom Teachers

39 teachers

Student-Teacher Ratio

11:1

National avg.:

Average Class Size

15 students

Number of AP/Advanced Courses

34 courses

Tuition and Acceptance Rate

Admission Deadline

None / Rolling

Yearly Tuition Cost

$17,100

View national tuition avg.

Application URL

School Notes

School Mascot: Captain Blazer

Trinity High School, founded in 1918 by the Dominican Sisters of Sinsinawa Wisconsin, is a Catholic college-preparatory high school for young women. Trinity has earned an excellent reputation as a premier high school with a strong commitment to educating young women and preparing them for the future: intellectually, spiritually, socially, and morally. The school community guides young women in developing skills for lifelong learning, an ethnic of care and the desire for excellence. Each student is recognized as unique. In a nurturing, catholic, college preparatory enviornment, she is encouraged to become self-directed toward responsible participation in the Christian community in order to impact society, Church and family in the twentyfirst century.

Source: Verified school update

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Frequently Asked Questions

How much does Trinity High School cost?

Trinity High School's tuition is approximately $17,100 for private students.

What is Trinity High School's ranking?

Trinity High School ranks among the top 20% of private schools in Illinois for: Largest student body and Most AP courses offered.

When is the application deadline for Trinity High School?

The application deadline for Trinity High School is rolling (applications are reviewed as they are received year-round).

School Calendar

View the Trinity High School below. Note key dates such as:

Event

Date

School Closed in Observance of Labor Day

September 07, 2026 (Monday)

School Closed

September 25, 2026 (Friday)

School Closed

November 16, 2026 (Monday)

Thanksgiving Break: School Closed

November 25, 2026 (Wednesday)

Christmas Break: School Closed

December 21, 2026 (Monday)

School Reviews

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Quick Facts (2026)

Top-Ranked IL School
Grades: 9-12
Enrollment: 422 students
Yearly Tuition: $17,100
Average class size: 15 students
Application Deadline: None / Rolling
Source: Verified school update

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Did You Know?

The average private school tuition in Cook County, IL is $13,626 for elementary schools and $19,847 for high schools (read more about average private school tuition across the country).

The average acceptance rate in Cook County, IL is 83% (read more about average acceptance rates across the country).