While other students across the region have been hitting the books for a week or more, kids throughout much of northern Virginia are trudging off to their first day of school.

Tuesday marks the start of the school year for students in Arlington and Fairfax counties and Alexandria.

The post-Labor Day start has been something of a tradition in Virginia, where the so-called King's Dominion law requires school to begin after Labor Day. School systems can receive waivers, though, and Loudoun and Prince William County schools have already started.

Next year, Fairfax County plans to join those jurisdictions starting the school year before Labor Day.

Maryland, meanwhile, is going in the opposite direction: Gov. Larry Hogan signed an executive order last week requiring school there to start after Labor Day.