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) , the California Association of Independent Schools (CAIS) and the Western Association of Schools and Colleges (WASC). VMS is a certified California Green Business making us the only school in the Tri-Valley and just one of four Montessori schools in the state of California with this distinguished honor. Valley Montessori is a nationally recognized model of Montessori education, attracting the best and brightest educators and staff.