What's The Earliest that Halloween Candy and Costumes Should Go on the Shelves?

We see it every year. It creeps onto the shelves earlier and earlier. How soon should all the sweet and scary stuff go on the shelves?

NiseriN

I'm not exactly sure in which store it was or when it happened but I'm sure there was a lot of the Halloween regalia and treats on the shelves shortly after the Fourth of July.

Why do the retailers feel the need to cram this stuff down our throats so early? By the time the holiday and /or event is here, we're tired of seeing the leftovers scattered in the stores.

So, here's the question...how soon is too soon? When should Halloween costumes and candy go on the shelves?