As soon as you enroll in a Nanodegree program, you will have access to the classroom content.
The classroom start dates and project due dates are general guidelines for students, to provide you with some structure and guidance around the pace we see most successful students move through the program. It also helps ensure you join a community of other students who start their learning journey around the same time. If you "miss" this date, you may have a different group of students in your community channels.