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New Families Guide

Upperclassmen show new students the ropes during orientation

Welcome to St. Sebastian's!


We’re excited to have your family join the Arrows community. This page will help you get oriented in the months ahead, with key dates, academic information, and helpful resources for new families.

In July, you’ll receive access to the My Sebs Parent Portal—a password-protected section of our website where you can view your son’s schedule, upload required health forms, order course materials, and more. We’ll also launch our Back-to-School Guide. In the meantime, we hope this page answers your initial questions and helps you feel prepared for the fall.


Next Steps

Before the fall term begins, there are a few important steps for parents and students to complete as part of the enrollment process. Please take a moment to review the information below.

Key Dates for 2026-27

The important dates for the upcoming school year—including the academic calendar, holidays, and school vacations—can be found here.

View Key Dates Handout

Our detailed online calendar will be updated by mid-July, once the school year calendar is finalized.

Student Guidelines

The 2026–27 Student Guidelines will be available in August. In the meantime, the 2025–26 Student Guidelines is linked below for reference.

View Student Guidelines

Academic Information

Summer Reading & Assignments

Summer Reading lists, reading guides, and any required summer work for select Spanish and Math courses will be shared at the New Parent Reception and linked from this page, along with information on ordering required books. Each summer, Head of School Brendan Sullivan also selects a shared All-School Read for the entire community.

More details coming soon.

Student Life

Additional Resources

Can't wait? Check out our Summer Programs!

Academic Workshops / Athletic Clinics / Strength & Conditioning