Highest Average ACT Scores

Among "All-Girls Schools", view the boarding schools with the highest average ACT scores (2026).
For several key reasons (listed below), these comparisons are intended only as informal reference points for evaluating the ACT taking ability of a school's student body.
A school's average ACT score is based on a relatively small sample of students from year to year (typically less than 100 students for a graduating class).
Average ACT scores, then, can naturally fluctuate year to year while the quality of the overall program and strength of the student body remains consistent.
Schools in the list below are often separated by small statistical differences, which for all intents and purposes, are not meaningful in determining the overall strength of the student body between two schools.
As a final note: average ACT scores should never be used by a family as an expectation of what score they can expect their child to receive if they go to a particular institution.
Dana Hall School
Grier School
Santa Catalina School
Chatham Hall
Emma Willard School
The Ethel Walker School
Garrison Forest School
Miss Porter's School
Westover School
Buffalo Seminary
St. Margaret's School
Average ACT Score
(Out of 36) Range:
21
28 Avg. Average ACT Score
(Out of 36):
26

Quick Facts (2026)

  • # Boarding Schools: 11

Highest Average ACT Scores

Among All-Girls Schools (out of 11 schools)

Sorted by range (alphabetically within range)
Dana Hall School Photo
#1(T1–T4)Dana Hall School
Gr: 9-12 | 5-12 (day)
All-girls
45 Dana Road
Wellesley, MA 02482
(781) 489-1331
(6)
Grier School Photo
#1(T1–T4)Grier School
Gr: 7-12, PG | 5-12, PG (day)
All-girls
2522 Grier School Road
Tyrone, PA 16686
(814) 684-3000
(6)
Santa Catalina School Photo - Come visit our beautiful campus in Monterey, California! Call the admission office at 831.655.9356 or email admission@santacatalina.org to schedule your visit.
Gr: 9-12
All-girls (Catholic)
1500 Mark Thomas Drive
Monterey, CA 93940
(831) 655-9356
(1)
Chatham Hall Photo - Our students thrive in a dynamic environment designed specifically for their success.
#4(T4–T10)Chatham Hall
Gr: 9-12
All-girls (Episcopal)
800 Chatham Hall Circle
Chatham, VA 24531
(434) 432-5516
(5)
Emma Willard School Photo
Gr: 9-12, PG
All-girls
285 Pawling Avenue
Troy, NY 12180
(518) 833-1320
(9)
The Ethel Walker School Photo
Gr: 7-12, PG | 6-12, PG (day)
All-girls
230 Bushy Hill Road
Simsbury, CT 06070
(860) 408-4200
Garrison Forest School Photo - One of the entrances to Garrison Forest School.
Gr: 8-12 | PK-12 (day)
All-girls
300 Garrison Forest Road
Owings Mills, MD 21117
(410) 559-3111
Miss Porter's School Photo
Gr: 9-12
All-girls
60 Main Street
Farmington, CT 06032
(860) 409-3530
(5)
Westover School Photo
#4(T4–T10)Westover School
Gr: 9-12
All-girls
1237 Whittemore Rd.
Middlebury, CT 06762
(203) 577-4521
(12)
Buffalo Seminary Photo - Our oldest tradition may be forward thinking but we are anchored in many other traditions too. Roses and white dresses for commencement. Our Social & Academic Honor Code. Morning Meeting to start the day. ..
#10(T10–T11)Buffalo Seminary
Gr: 9-12, PG
All-girls (non-sectarian)
205 Bidwell Parkway
Buffalo, NY 14222
(716) 885-6780
St. Margaret's School Photo - College Preparedness: Challenge yourself with a collaborative STEAM curriculum and rigorous academics, including Advanced Placement and Dual Enrollment courses to start earning college credit. Our college counselor will help you to navigate the different colleges and degree fields to best prepare you for life after graduation from St. Margaret's.
#11(T11–T12)St. Margaret's School
Gr: 8-12, PG
All-girls (Episcopal)
PO Box 158, 444 Water Lane
Tappahannock, VA 22560
(804) 443-3357
(7)

Recent Articles

When a Boarding School Scholarship Comes With Conditions: Questions to Ask Before Accepting
When a Boarding School Scholarship Comes With Conditions: Questions to Ask Before Accepting
Learn what boarding school scholarship conditions mean, how renewal requirements work, and the questions every family should ask before accepting an award.
The Boarding School Net Price Test: What to Compare After Financial Aid Offers Arrive
The Boarding School Net Price Test: What to Compare After Financial Aid Offers Arrive
Learn how to compare boarding school financial aid offers, calculate true net cost, and identify hidden expenses before making your enrollment decision.
Building Your Boarding School Shortlist: A Data-Driven Approach
Building Your Boarding School Shortlist: A Data-Driven Approach
Learn how to compare boarding schools using a data-driven approach that helps families build a smarter, more personalized shortlist.

Featured Schools

Featured Schools