School Calendar

A year at the School of St. Mary moves with purpose, from the first morning bell in late August to the last day in June. The dates below outline the framework of our academic year: the first and last days, school breaks, and days with no classes. Current families will find the full daily calendar, athletics schedules, and classroom events in MySOSM.

Key Dates (2026-2027)

List of 4 items.

  • Tuesday, August 25, 2026

    First Day of School
  • Monday, September 7, 2026

    Labor Day, No School
  • November 25-27, 2026

    Thanksgiving Break
  • December 21, 2026 - January 4, 2027

    Christmas Break

List of 4 items.

  • Monday, January 18, 2027

    Martin Luther King Jr. Day , No School
  • Monday, February 15, 2027

    Presidents' Day, No School
  • March 22 - 29, 2027

    Spring Break
  • Professional Development, No School

    • Friday, September 25, 2026
    • Friday, November 6, 2026
    • Friday, February 12, 2027
    • Monday, April 26, 2027

List of 3 items.

  • Monday, May 31, 2027

    Memorial Day, No School
  • June 4, 2027

    8th-Grade Commencement
  • June 10, 2027

    Last Day of School

Full Calendar for Current Families

Current families: log in to MySOSM for the full daily calendar, athletics schedules, and classroom events.

Experience School of St. Mary for Yourself

A Roman Catholic School Since 1917

To Learn, To Serve, To Lead

Primary Grade Center

900 West Everett Road
Lake Forest, Illinois 60045
(847) 283-9800

Upper Grade Center

185 East Illinois Road
Lake Forest, Illinois 60045
(847) 234-0371