We homeschool as you know, and I start when the local schools do. I personally prefer a later start since the weather is still beautiful in August. It used to start the last week of August, but 3 years ago they moved it to the 3rd week of August so the kids would get an extra week to study for the standardized tests.

My sons birthday fell on the first day this past year, so I was kind and waited until the following Monday to start. We don't get snow days or take too many days off so we usually are done in May with an official year.