River Montessori Elementary Charter is a public charter school in Petaluma, California, that teaches kids from kindergarten to sixth grade.The school has about 130–140 students and a student–teacher ratio of 19:1, which is a little lower than the state average. This lets teachers give more personalized instruction. River Montessori uses the Montessori method of teaching, which means that students learn by doing and are in mixed-age classrooms with trained teachers. The student body is fairly diverse, with about 45% of students coming from minority groups, such as Hispanic, multiracial, and others. According to U.S.News data, 42% of students meet or exceed math proficiency standards, and 65% demonstrate proficiency in reading. This means that their reading skills are better than the average for their state. River Montessori Elementary Charter is a public charter school that doesn't charge tuition. It gets money from state and local education resources. People know River Montessori for its Montessori teaching style, its strong reading results, and its close-knit school community.