Hackley School
Tarrytown, Westchester County, New York · coed, K–12
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Short answer
Hackley takes grade 6 applicants through a full process, including a group activity on campus; for grades 3–5 it will arrange visits only once it knows whether there is space, and will contact families by January 15, 2027. The ISEE or SSAT is required for grades 5–11 and must be taken by January 4, 2027. The preliminary application is due December 1, 2026, and decisions come on February 10, 2027.
At a glance · 2026–27 season
- Admits grade 5
- As space allows
- Admits grade 6
- Yes
- ISEE, grade 6
- Required
- Application deadline
- December 1, 2026 preliminary application
- Decisions
- February 10, 2027
- ISEE, grade 5
- Required
- Score ranges
- Not published
The SSAT is accepted instead
Glentavo has no connection with Hackley School. This page summarizes what the school publishes; the school's own pages are the authority, and dates can change during the season.
What kind of school is Hackley?
Hackley School is a coed school in Tarrytown, in Westchester County north of New York City, from kindergarten to grade 12. Its Middle School covers grades 5–8. It is outside the city, and is listed with the New York City guides as a nearby option.
Does Hackley admit grades 5 and 6?
Grade 6: yes. Grade 6 applicants are welcomed on campus with other grade 6 applicants for a group activity, and parents book a virtual or in-person interview. The school does not publish the number of places.
Grade 5: as space allows. Until the school understands space in grades 3–5, it will not arrange class visits or parent interviews. If space opens, it will contact families by January 15, 2027, for a late-January visit.
Does Hackley ask for the ISEE? Can the SSAT stand in?
Grades 5 and 6: required, either test. The school says the ISEE or SSAT is required for applicants to grades 5–11, taken no later than January 4, 2027. School codes: ISEE 335540, SSAT 3640.
Does Hackley publish score ranges?
No. The school's pages give no score ranges or minimum scores.
This season's timeline (2026–27)
- Preliminary application duePreliminary application (family portion) due.
- Interviews bookedInterviews and visits booked in the portal.
- Last test dateLast day to take the ISEE or SSAT.
- Documents dueTranscripts, recommendations and supporting documents due.
- By January 15, 2027Grades 3–5: the school contacts families if space opens.
- DecisionsDecisions for grades 1–8.
- ReplyReply date.
As listed on Hackley's How to Apply page on October 25, 2026. The school's pages are the authority.
How do the interview and visits work?
Interviews and visits are booked in the Hackley admissions portal by December 4, 2026. Grade 6 applicants come for the group activity; parents interview virtually or in person.
Grade 6 applicants need recommendations from their English and math teachers and from a principal or counselor, and transcripts for the current and two prior years, all by January 8, 2027.
How to prepare
Hackley's test deadline is January 4, 2027, a few days earlier than most document deadlines. A grade 6 applicant taking the ISEE sits the Lower Level. A grade 5 applicant also needs a score, even though space may not open. How often a child may sit the ISEE is covered in our ISEE guide.
Glentavo's practice tests follow the ISEE Lower Level format.
Common questions
Does Hackley accept the SSAT?
Yes. The ISEE or SSAT is required for grades 5–11.
When must the test be taken?
No later than January 4, 2027.
Is grade 5 open at Hackley?
Only if space opens; the school will contact families by January 15, 2027.
When does Hackley release decisions?
February 10, 2027, for grades 1–8.