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Quick Facts

DSCN5483

Enrollment: 165
Grades: Toddler through 8th grade
Founded: 1985 – Affiliated with American Montessori Society
Financial Aid: Need-based tuition assistance is available. Please ask for an application.
Hours: Student drop-off begins at 8:15.
Classroom Start Times: Primary:
8:30 to 11:30
8:30 to 1:30
8:30 to 3:00 
Dismissal times in primary are determined by child’s developmental readiness for an extended academic day.
Elementary and Junior Class:
8:30 to 3:00
After School Care: 5:00 – last dismissal. (Open to all students except toddlers)
Summer Camp: 6 weeks, for ages 3 years to 9 years.
Faculty: 25 faculty and staff, 21 of whom have one or more levels of Montessori certification
Click here for our faculty page.
Board of Directors: 8
High Schools Attended
by Cornerstone Graduates:
  • Berwick Academy
  • Brewster Academy
  • The Cambridge School of Weston
  • Catherine McAuley High School
  • Cocheco Arts & Technology Academy
  • Coe-Brown Northwood Academy
  • The Derryfield School
  • Dover High School
  • Exeter High School
  • Gould Academy
  • The Governor’s Academy
  • Great Bay E Learning Charter School
  • The Holderness School
  • The Landmark School
  • Marshwood High School
  • The Middlesex School
  • Milton Academy
  • New Hampton School
  • Noble High School
  • Northfield Mount Heron
  • Oyster River High School
  • The Peddie School
  • Phillips Exeter Academyl
  • Pinkerton Academy
  • Portsmouth Christian Academy
  • Portsmouth High School
  • Proctor Academy
  • The Putney School
  • St. Thomas Aquinas High School
  • Somersworth High School
  • Sutton Park School, Ireland
  • Tabor Academy
  • Tilton Academy
  • Westover School
  • White Mountain School
  • Winnacunnet High School
  • York High School