You can always try to enroll your children for school when they get here in October. Keep in mind that the school they go to might not be your top choice or neighborhood school. With late enrollment, children are usually sent to a school that still has spaces available. Good luck with the enrollment process.
It is federal law in the United States that any child who can prove residency within a certain school district be allowed to register in the local school. Be sure to bring documentation of your place of residence, health records and any previous school records to make the processing in to a new school easier.