All year long. But online classes begin only in the first week of September. Late students are sometimes accepted, depending on circumstances, classes and dates involved. The early enrollment discount begins each year on April 1. Prior to April 1 we sometimes do not have the class times for the following Fall semester posted. We encourage enrollment in April, or as early as parents have reached a decision, so that they reserve the online class time(s) that is most convenient for them. When an online class fills, we do close enrollment in such classes, and may or may not add more at other times. Once enrolled, the class time selected is reserved for that student. These may be changed, provided other classes are not full.