With Halloween less than two weeks away, Denver is looking very un-scary when it comes to Zillow's Trick-or-Treat Housing Index, which measures the most friendly cities for costumed kids knocking on doors—and that's good news. Denver finishes number five on the list, meaning local trick-or-treaters stand to bag loads of candy.

In Seattle, which tops the index, the Post-Intelligencer takes a closer look at the methodology used by Zillow, which writes that "wealthy neighborhoods are not always the best for harvesting the most Halloween candy." Rather, "the walkability and density of a neighborhood is key to covering the most ground, in the fastest time, to collect the most candy. Safety, of course, is also a primary concern for parents on Halloween, thus adding crime data to the Index was a no-brainer."

Bloomberg Businessweek, meanwhile, reminds parents that sweets, particularly those made from chocolate, have a shelf life of two weeks to a year, with a general rule of "the softer the candy, the shorter the shelf life." And that expiration date is important: Old chocolates can cause salmonella poisoning.