Can I freeze leftover Halloween candy?

You can freeze chocolate and gummy candy, some stuff like jelly beans might thaw odd. I did it one time and they were grainy. Depending on the type of chocolate, it may turn lighter in color, but it's still good/safe.

However, are you sure you really want to? You'll know it's in the freezer and it doesn't take long to thaw or pop in the micro........ Out of sight, out of mind doesn't always work so well for diets! Maybe better to give it to a neighbor? That's what I Halloween Costumes do asap, after keeping a bit, of course. lol

Good luck on your diet!