While I’m sad that S6 will be a shortened season, I’m glad they’re having a chance to properly end it (and hopefully they’ll do it well) instead of it getting cancelled after a season’s cliffhanger or something. I’m not sure why it’s starting later though? I thought it worked so well starting around Halloween with the subject matter

I agree, I always loved getting a new season of Grimm right before Halloween. But the network hasn’t given a reason for the change yet, and may not. Presumably they have some show they think will do better lined up for Grimm’s time slot in the fall. Either that, or it’s to give the cast and crew of Grimm extra time for filming. Who knows, really?