Cancellation. On August 8, 2011, it was announced that Eureka would be cancelled after five seasons. Syfy decided not to order a season six of Eureka: "But Eureka is not over yet. ... We thank the fans for their support of this show and know they will enjoy its final season in 2012."

Why did they cancel Eureka?

During its run, Eureka was one of Syfy's more successful series, but was expensive to make. ... Syfy originally renewed Eureka for a sixth shortened final season of six episodes. By then though, Comcast owned 51% of NBC-U and nixed the deal for financial reasons, leaving Eureka cancelled.

Did Eureka have an ending?

The Department of Defense was shutting down Eureka, so he bought it and Global Dynamics. Everyone got their happy ending, with Jo and Zane finally engaged, Holly and Fargo traveling the world together and Zoey getting ready to graduate college.