Fudge Recipes - Shelf Life
Fudge really only has a shelf life of a week or two. First it will start to crystallize on the outside (which is actually very yummy in my opinion), but then it will start to grow mold. Good hygiene will lengthen the time before mold starts to grow, but ultimately fudge is not a preserved food and isn't meant to keep. The individual ingredients will keep better by themselves, and you can make the fudge nearly on demand.