I have not done this but keep in mind these types of schools fall under the private school category from what I have always heard. Because of this they are not held to the same standard as public schools.

Maybe someone else can give you info about experiences with this type of school

Just a quick update -

So for I have visited two Montessori schools in the area. I brought my son to the first, and left him home for the 2nd school visit since he had the sniffles.

The first school was very welcoming. As soon as my son walked in he was engaged with the puzzles and toys and seemed to fit right in. I disclosed his ASD diagnoses to the schools Director and she was very supportive and receptive to his needs. She highlighted that kids "learn on their own" and the teacher prescribes two lessons - one in morning and one in afternoon. In addition to regular academic oriented lessons they also learn "life skills" like cleaning up, washing hands, gardening, etc. The teacher and teachers assistant goes around the classroom to provide guidance on the lessons of the day and provide 1-1 support as needed. The children are grouped from ages 2.5 - 6 years old. The older kids often become mentors and assist the younger kids with their activities. In addition, there is another autistic child already in attendance and the Director advised his behavior, skills, and learning have shown tremendous improvements. He has a private ABA therapist join him in the mornings for a few hours to supplement his specialized learning needs.
I was advised that we could trial for a few weeks or a month for 1/2 days and see how he does and go from there. All in all, this first school was very becoming and I think this would be an awesome environment for him.

The second school we visited was not receptive to my son's special needs. When I disclosed the ASD diagnosis, and indicated that he would need 1-1 assistance with the lessons the Director advised Montessori would not be the right fit for him. No other children have an autism diagnosis there. She advised there were other schools designed for the needs of Autistic children. This experience was frustrating and I do not agree. In a way I felt like it was a bit of discrimination. BREATH.

In any event, I have a visit planned with third school in the area tomorrow morning. Fingers crossed. I'll post an update.

Thank you!