User blog comment:SprattieGaming/When do you think Season 5 will be released?/@comment-31135394-20170507035057

I suspect it might be October, too. They announcement that HTTYD3 was being pushed back again came during the hiatus between RttE seasons 3 and 4. So that may have been part of the reason season 4 was also pushed back. If they start releasing the new seasons at 8 month intervals, the third movie would be coming out about 8 months after the release of season 6, too. It would be perfect timing. That way, we won't have a year of HTTYD drought right when fans should be hyping up for the third movie. That wouldn't be a smart marketing move. So it makes sense.

But who knows, we might luck out and get S5 in June or July. Not sure how we'll cope with nothing new HTTYD related to enjoy for a year and three months if they go back to the 6 month intervals, though.