PublicCharterGrades K-6
River Montessori Elementary Charter School
3880 Cypress Drive Suite B, Petaluma, CA 94954-5613(707) 778-6414
Total Students144
Student/Teacher24.08:1
Math Prof.57.41%
Reading Prof.61.11%
School Information
Charter SchoolYes
Magnet SchoolNo
Virtual SchoolNo
CountySonoma
School DistrictOld Adobe Union School District
Principal / AdminKelly Mannion(707) 778-6414
Founded2009
Free/Reduced Lunch24.31% Eligible
Acceptance Rate100%
Student Demographics
White56.2%
Hispanic20.1%
Black2.1%
Asian5.6%
Two Or More16%
Gender Distribution
59.7%
40.3%
Male Female
Students per Grade
Grade 119
Grade 222
Grade 321
Grade 418
Grade 513
Grade 63
School Calendar 2026-2027
August 2026
Academic Schedule • 2026-2027
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River Montessori Elementary Charter School
Academic Calendar (2026-2027)
July 2026
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August 2026
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September 2026
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October 2026
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November 2026
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December 2026
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January 2027
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February 2027
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March 2027
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April 2027
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May 2027
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Key Dates & Holidays
First Day of SchoolAug 12
Labor Day HolidaySep 7
End of 1st TrimesterOct 30
Veteran's Day HolidayNov 11
Parent Conferences Early DismissalNov 12
Fall BreakNov 23
Minimum Day Dismissal Before Winter BreakDec 18
Winter RecessDec 21
Lincoln's Birthday ObservedFeb 8
President's Day HolidayFeb 15
End of 2nd TrimesterFeb 26
Parent Conferences Early DismissalMar 8
Spring BreakApr 5
Staff Appreciation Minimum DayMay 7
Volunteer Appreciation Minimum DayMay 21
Memorial Day HolidayMay 31
Minimum Day / Last Day of SchoolJun 2
End of 3rd TrimesterJun 2
Key Dates & Holidays
2026-2027Community Reviews
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