I agree that you should visit a few now and, if the fee is not too high, get on the waitlist for one of two you like. I started at the state's education web site which a list of all licensed preschools. I also asked friends for references, grabbed those free "parenting" newsletters you find in doctor's offices for the ads, looked at some of the places we're considering for elementary school to see if they had pre-k programs and checked local review sites and the BBB site. Depending on your beliefs, you could also check out local churches, temples, etc.  It seemed overwhelming at first, but it wasn't so bad.Â
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Our case is a bit skewed since we're in an area with very long waitlists (I signed up for my company's onsite preschools (there are 4 of them)  as soon as I found out I was pregnant, but was still on the waiting list until I withdrew when DD this past September!) and high costs (if I sent her 5 days a week 830a-230p, our final 3 choices would be just $200- $400 less than my monthly mortgage).  Plus  I had a couple of non-neg. requirements - the preschool needed to be in one of two  neighborhoods (so that I could pick her up, take her to my parents and get back to work all within an hour) and preferably near public transportation.  To make sure I had time to explore different programs and find a good one I could afford, I started looking just before DD was born.  I narrowed down my list and started visiting programs when she was about 1.5 and then registered her for a program about 4 months after that.Â