Within 48 hours of finishing the lamination of the croissant detrempe, you may choose to:
Wrap it well and freeze it up to one month for later use.
Roll, cut, and shape the croissants in the evening, spacing them on a parchment-lined baking sheet as you would for baking. Cover the croissants lightly with plastic wrap, then refrigerate overnight. In the morning, bring the croissants to room temperature to finish the proofing process. Egg wash the croissants, then bake as directed.
Roll, cut, and shape the croissants, then place them on a parchment-lined baking sheet and freeze. Once frozen solid, consolidate the croissants down into a zip-top bag or container and freeze up to one month. The night before you'd like to serve the croissants, remove the frozen croissants from the freezer and place them on a parchment-lined baking sheet, spacing as you would for baking. Cover the croissants lightly with plastic wrap, then place them in the refrigerator to thaw and slowly begin the proofing process ov3ernight. In the morning, bring the croissants to room temperature to finish the proofing process (or speed it up by turning your oven into a proof box-see below). Egg wash the croissants, then bake as directed.