If frozen, up to 2 months. You should never attempt to freeze ingredients that have not been thoroughly cooked. You may prepare the dish and freeze it before cooking, but it will require a thawing. Not only is that time consuming, but a tad risky. Only freeze pre-cooked French toast. It can simply be reheated when you are ready to use it. 1.) Allow each piece to cool down thoroughly before placing it in the freezer. This may be done on a wiring rack and will help in retaining the crispiness. 2.) Wrap each piece with wax paper, and you will find it is easier to reheat. If you must freeze again, be sure to use heavy-duty aluminum foil or even a solid freezer bag. The second – but slower - option It is possible to place your French toast on a baking rack to cool it. Immediately afterward, you may then put it in specially-designed freezer bags. You may also freeze in wax paper, remove the paper, and transfer each piece to a safekeeping bag. This method is useful for traditional toast, Nutella French toast, and all other varieties.