Chesterfield Montessori School 14000 Ladue Rd, Chesterfield, MO63017 The Chesterfield Montessori School has been in operation since 1981 offering programs for kids 16 months through grade…More 6. By September of 2011, the school will also feature adolescent programs for students in 7th and 8th grade. The school is accredited by Association Montessori Internationale and is housed on a five acre campus that features two tennis courts, a playground, swimming pool and garden. Students are accepted from a variety of countries and diverse backgrounds and montessori teacher training programs are held at CMS during the summer break. Please see the website for more information on this school.