Students also head to class in Polk and Manatee counties, while Hillsborough County students begin on Tuesday.
In Pasco, Superintendent Kurt Browning told district employees in a video that an administrative transformation at district headquarters is complete and the district staff is ready to provide support to schools.
And there are changes at several Pasco elementary schools.
*Lacoochee Elementary embarks on a state-required turnaround program, designed to improve student performance that has earned a D three years in a row. Principal Latoya Jordan is new to the school, as are about half the members of the teaching staff.
*Quail Hollow Elementary in Wesley Chapel and Shady Hills Elementary have been closed for renovations. Quail Hollow students were rezoned for Wesley Chapel Elementary or Watergrass Elementary. Shady Hill students will attend Crews Lake Middle, which has been turned into a K-8 school.