Keystone Montessori School Has moved to 3245 Old Frankstown Road in Plum Now Enrolling: 2 year old classroom. Ages 3 to 6 years old, mixed age classes. September through May 2020. Montessori based school. Established in 2008. 724-733-1015 www.KeystoneMontessoriProgram.org LOOK FOR OUR AD INSIDE! adno=6713717 Keystone Montessori School Has moved to 3245 Old Frankstown Road in Plum Now Enrolling: 2 year old classroom. Ages 3 to 6 years old, mixed age classes. September through May 2020. Montessori based school. Established in 2008. 724-733-1015 www.KeystoneMontessoriProgram.org LOOK FOR OUR AD INSIDE! adno=6713717