Most 3-year-old preschool teacher couldn't care less whether your child knows letters or numbers. They are far more concerned about whether he/she is independent in the bathroom (required under most state health regulations), whether he/she can play with others, or whether he/she can respond appropriately to an adult authority figure.

My "YES!!" answer was assuming that the preschool has a class for 3 year olds. I doubt that he would be allowed to enroll in a class for older children.

I encourage you to wait until he's the age of the other students because then if he's younger all his friends will be one year ahead of him, which isnt fun, and he would have to stay in pre-School longer then usual until hes old enought for Kindgergarden

YES!!!

Sometimes the question is "is mommy ready for the baby to go to school." The first few weeks of school, whether it'd be pre-K or Kinder will be hard and scary for both of you, your baby is used to all the things mommy does, and going out in the world will be difficult yet fun for him. Pre-School is about learning to socialize, and being able to participate amongst other children in games, follow rules etc. I believe a child if your child seems okay to be on his own you should try it, absolutely. Do the 3 day a week for 3-5 hours first, and let him experience it. Go more days a week later if he enjoys it, and don't be scared of trying other pre-K's if the first one doesn't do you both well. I had to go through 3 pre-K's before finding one that suited both my needs and my oldest's needs, she is now 11 and ready for middle.

As I consider preschool as primarily for social interaction (which can totally be accomplished without, IMO), there are no specific guidelines. On the other hand, some kids might have a harder time adjusting to a classroom situation than others. My almost-4yo has known all of his letters and numbers since he was 2. But it has only been somewhat recently that he has let go of some of his anxiety about being around other people. He is going to be in a 3 year old classroom this year while I'm teaching pre-k again, and my worries are his wildness and his public toilet anxieties. I have absolutely no worries academically, but for now he is not the type that would be able to adjust quickly to a classroom situation. A year ago you could have completely thrown the idea of having him in a classroom out the window. It's one reason why I am GLAD that pre-k is not mandatory.

I would recommend to enroll your son in preschool. they learn a lot plus they get familiar with what is schooling. If you wait til kindergarden he will have a hard time saying goodbye to you in the mornings and will not be familiar with working together with other kids. trust me he will have lots of fun and get familiar.

My son is four years old he is going to pre-school but Iam looking a great kinder for next year.

It sounds like he's ready...I encourage you to join the Preschool Parents Group at community.greatschools.net/groups/11534 and talk to others with similar age children.