R.
Our daughter will turn three in February and has been at Pebblecreek Montessori since she was 18months. She (and we) Love(s) it! She's doing so amazing there and learning so much. It's incredible and one of the more traditional montessori programs. the teachers are phenomenal! Our daughter is the most well behaved 2 y/o and so independent because they have such a positive learning environment focusing on life skills and independence. I can't say enough great things about Pebblecreek. They are located at Spring Creek off of Coit. They are currently selling their building to PISD and are building a new school somewhere around hedgecoxe I think that will be ready next year. They serve 18months to 5th grade. We LOVE it there. They have several class options including a 1/2 day, school day, and all year montessori. They have a PTO (similar to PTA) group, room moms, festivals, cultural day, and they follow the PISD calendar.
Good luck in your search!