Months ahead of Season 4’s debut in November 2018, the cable network announced the renewal order for both Season 5 and Season 6.
That said, there is definitely precedent for Starz to wear its confidence in Outlander on its (slightly puffy) sleeves.
So at that time, fans could take comfort in knowing that at least three more seasons were on the way.
But now, three years later, the episode reserve is starting to dry up, so it might behoove Starz to go public with Season 7 renewal news as soon as the decision is made.