Are they actually the Cadbury brand?
Halloween. Candy is the entire point of Halloween, it’s only a small facet of other holidays.
Christmas, solely because of Mint M&Ms.
But this past year they sold only fatter-than usual M&Ms in the mint variety - incorrect ratio of chocolate to shell. Was VERY disappointed. Still ate the whole bag though.
Few years ago when I lived in the dorms mom sent me a winter finals care package - included one of those big bags of Mint M&Ms. Oh god, ate it in 2 days.
Yup. They were all together on the shelf, each egg had a different color wrapping. I can’t remember what color the peanut butter one was but I bought one each of the caramel, peanut butter, orange cream, and original cream.
This is what I was going to say, only I will consent to eat bunny-shaped Peeps as well.
April 20, of course. 
St. Pat’s!
Oh wait, beer is not candy.
Christmas cookies are really great, but are they candy?
There is just something special about a huge chocolate bunny. Something bigger than your head. So, Easter is the clear winner.
The best ones have candy in or on them!
Halloween. Reason: Reese’s Peanut Butter Pumpkins. MMM.
Easter? You people are seriously saying Easter? Easter candy is all jelly beans (okay I guess), robin eggs (malted milk blah), hollow chocolate bunnies (low-grade chocolate), and peeps (a marshmallow with a tiny bit of sugar on it, that goes stale 15 minutes after opening). That can’t even compare with Smarties, Tootsie Rolls, Atomic Fireballs, Gummy Spiders, Candy Corn, Nerds, Bottle Caps, and SweetTarts. Halloween even has the best form of peeps: the Cocoa Bat! Suck on that, basket-toting losers!
If gravy counts, Thanksgiving.
Otherwise, Veteran’s Day.
Although my first impulse was to go with the horn-o’-plenty (with mini-boxes of Good-'N-Plenty!) that is Halloween, on second thought I’ve got to go with Christmas, for three reasons: multicolored ribbon candy, chocolate-candycane bark, and alcohol-filled chocolate bottles (the good stuff, with Grand Marnier, Cointreau, Jack Daniels, etc.) And on that boozy note, don’t forget the brandy-soaked chocolate cakes and fruitcakes, either… although they aren’t candies…
Mmm, chocolate-spirits bottles. Candy… with booze! How can anything top that?
I’m voting for Easter, because the large majority of Halloween candy is miniature versions of always-available candy.
<slight thread hijack>My most-missed no-longer-in-production Easter candy (they were available only in the northwest as far as I know were Eggheads, made by Brown & Haley. They were slightly smaller versions (it sounds like I’m being hypocritical based on my comments above, but read on) of the Mountain Bars (a chocolate lump vaguely resembling Mt Rainer with cherry, vanilla, and peanut butter fillings), but with they had a chocolate-filled one that was fantastic. I’d buy a dozen or so and put them in the freezer, hoping to make them last for a while, but I think three weeks was as far I made it.</hijack>
Well, here in Maryland, you can’t find those too much. The best you can normally do is miniature chocolate bottles filled with liqueur-flavored liquids. Blech. But my sister got a box of these for Christmas (she lives in PA), and since her stomach cannot handle any amount of liquor any more, she brought them to the Easter dinner we were both attending, and gave them to me! So, this year, Easter is my favorite! 
In addition, Easter is when you find Whopper’s eggs. Those hard-shell covered malted milk things are far superior to chocolate-covered, imho.
Those are Robin Eggs, and what I can’t get enough of at Easter. Chocolate coconut bird’s nests and good jelly beans are runner ups for me.
Like has been said Halloween is stuff you can buy at any time.
Now for June Dairy Month in Wisconsin, you should get some Cow Pies. The Baraboo Candy Company has some very good chocolate candy besides the Cow Pie. Look for them across from the Ho Chunk Casino.
Mmmmm. Jelly Bellies. Juicy Pear and Buttered Popcorn are my favorites. The Bubble Gum flavor tastes so much like bubble gum I have to remind myself it’s OK to swallow it! 
Oh, I vote for Easter! Russell Stover’s coconut cream eggs, strawberry cream eggs and the wonderfull green coconut nests with tiny jelly bean eggs! Add to it malted milk ball eggs and I am at my candy nirvana time of year!
And of course, it’s time to harvest last year’s Peeps! We always put a pack or two away to let them ‘age’ so they get crunchy or chewy - whatever the humidity had wrought over the last year.
Definitely not Yom Kippur.