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Yeah, Miami dade county is Tuesday, and Broward County is Monday.

The people I know are starting this Tuesday as well. However, that is for private school. Schools start on weird days sometimes because it helps them stay on track so they don't start summer too late or too early. That's what my understanding is anyway.. anyway, if you still have doubts, you can check the Miami-Dade public school schedule, as every public school follows the same schedule I believe.

No because new years is saturday and sunday people need to relax and so do people on monday so yes tuesday it starts