Is it legal for a public school to make a disabled child wait 30 days to start school?

I have a child who has cerebral palsy. He has been homeschooled and is now 9 years old. I have asked about getting him started in public school. The school's website says a student can start 1-2 days after registering. However, the special ed coordinator tells me my child has to wait up to 30-45 days before he can start. She says they need to get him evaluated and everything "set up" for him before he can start. Doesn't the school have an obligation to give him reasonable accommodations within the same time frame as "normal" students?