Board Thread:Spoilers!/@comment-5679696-20140501175957/@comment-908565-20140506163625

The Dark Curse took place in 1983 and the events of Kansas, when Regina is still fresh-faced, can only be about a decade before that, so they took place in the 70s-80s. Dorothy and Walsh can only be from before 1900 if they time travelled, which the writers say doesn't happen in the Once-verse (without something like Zelena's spell).