PublicCharterGrades 6-8
Twin Hills Charter Middle School
1685 Watertrough Road, Sebastopol, CA 95472-4647(707) 823-7446
Total Students207
Student/Teacher16.93:1
Math Prof.54.68%
Reading Prof.67%
School Information
Charter SchoolYes
Magnet SchoolNo
Virtual SchoolNo
CountySonoma
School DistrictTwin Hills Union Elementary School District
Principal / AdminShawna Whitestine(707) 823-7446
Founded1980
Free/Reduced Lunch21.26% Eligible
Acceptance Rate100%
Student Demographics
White58%
Hispanic24.2%
Black0.5%
Asian1%
Two Or More15%
Gender Distribution
43.5%
55.1%
Male Female
Students per Grade
Grade 664
Grade 781
Grade 862
School Calendar 2026-2027
July 2026
Academic Schedule • 2026-2027
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Twin Hills Charter Middle 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
Independence Day ObservanceJul 3
First Student Day (Apple Blossom, Twin Hills CMS, SunRidge)Aug 13
Minimum Day (All Sites) - Start of SchoolAug 13
First Student Day (Orchard View)Aug 17
Wednesday Early Release Begins (Apple Blossom, Twin Hills CMS)Aug 19
Thursday Early Release Begins (SunRidge)Aug 20
Labor Day HolidaySep 7
Winter Break BeginsDec 21
Winter Break EndsJan 1
Minimum Day (Twin Hills Charter Middle Only)Jan 8
Martin Luther King Jr. Day HolidayJan 18
Lincoln Day HolidayFeb 12
Presidents Day HolidayFeb 15
Minimum Day (Twin Hills Charter Middle Only)Mar 19
Spring Break RecessMar 22
Local Holiday for EmergenciesApr 9
Local Holiday for EmergenciesMay 24
Last Student Day (Orchard View)May 28
Memorial Day HolidayMay 31
Minimum Days (All Sites)Jun 1
Last Student Day (Apple Blossom, Twin Hills CMS, SunRidge)Jun 2
Juneteenth Observed HolidayJun 18
Key Dates & Holidays
2026-2027Community Reviews
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