How do you say first day of school in french?

The most common and direct translation for "first day of school" in French is:

"Le premier jour d'école"

Here's a breakdown:

* Le: The (masculine singular definite article)

* premier: first

* jour: day

* d'école: of school

You can also say:

* La rentrée des classes: This literally translates to "the return of classes" and refers to the start of the school year.

* La rentrée scolaire: This means "the school return" and is another way to refer to the start of the school year.

These phrases are all used interchangeably to express the start of the school year in French.