Your Halloween Headquarters: Spirit Halloween Opens in MissoulaNow the big store is open. Spirit Halloween is officially open, giving Missoula Halloween fans plenty of time to get ready. Chris Wolfe Spirit Halloween MissoulaWhich, honestly, is a pretty effective Halloween theme for Montana. Get Ready for Halloween: Why Planning Now WorksAnd here's another reason I like checking out places like Spirit Halloween. Spirit Halloween is open in Missoula, and if you want the best selection, I'd say go sooner rather than later.