Actually MOST of the districts in the Dallas/Ft. Worth area go back August 14th. There are a few exceptions that do go earlier but I do know that those 2 HUGE districts and the ones inbetween as well as private schools have that date as the start date or even a few days later. ( I am a mommy who has 2 little ones in school, I am also teacher in one of the inbetween districts and my dbf works in Dallas district).
Next school year there will be a law in place that won't allow ANY districts in all of Texas, I believe, to begin before the 4th Monday of August!