Valley Montessori School is the largest not-for-profit, and only triple accredited school in California. We are fully accredited by the American Montessori Society (AMS) with non-traditional age groupings at the Upper Elementary and Middle School Levels, the California Association of Independent Schools (CAIS) and the Western Association of Schools and Colleges (WASC). Valley Montessori is a nationally recognized model of Montessori education, attracting the best and brightest educators and staff.