No rule for this one
No ending or word group predicts the article of Zukunft. Learn it as a pair and say it out loud: die Zukunft.
die Zukunft
It's die Zukunft. Zukunft is feminine, plural die Zukunften.
In der Zukunft will ich in Köln wohnen.
In the future I want to live in Cologne.
No ending or word group predicts the article of Zukunft. Learn it as a pair and say it out loud: die Zukunft.