As of the second full week of August, millions of American schoolkids are heading back to school or have already started. And depending on where you live, that statement might produce a reaction of either “That sounds about right” or “That seems way too early!”

According to data from Pew Research Center, back-to-school dates in the U.S., it turns out, vary considerably by state and region, based on Pew’s analysis of a sampling of the nation’s 13,000-plus public school districts. By the end of the second full week of August, for example, nearly all elementary and secondary school students in the East South Central region—a Census Bureau division that includes Alabama, Kentucky, Mississippi and Tennessee—will be back in school. But not a single district in the nine New England and Middle Atlantic states will resume classes before Aug. 26, and many wait until after Labor Day.

The prize for the earliest start date among the 500-plus districts in Pew’s sample goes to Arizona’s Chandler Unified School District, which serves part of suburban Phoenix. The 44,000 or so students in Chandler Unified went back July 23 (though they get the first of three two-week “intersession” breaks starting Sept. 30). At the other extreme are the Trenton, New Jersey public schools, whose nearly 14,000 students won’t go back to school till Sept. 9—the latest opening date in the sample.

Click here to read the full story from Pew Research Center.