My daughter went to 2 year old preschool ( one day a week for 3 hours) but was throw out for disrupting the class with her crying- she just was SO not ready so after a week we decided that she should stop and try again the next year. The next year she was 3 and with the promise of some new roller blades for not crying she was fine LOL. After a week of not wanting to go back she then loved it-3 year old preschool was 2 days a week and 4 year old preschool was 3 days a week. At 4 here they also run a one day a week pre-K program at the school they will be going to the next year so she also went to that one. The one day a week one was great, got them used to the school, gym class, art, showed them how to buy hot lunch and how to come in, unpack their things and put their folders next tothe teachers desk like they will have to do the following year.