Since the show is really expensive and takes a lot of time for the shooting and editing, FOX decided they wouldn't have the time to prepare another 9 episodes for February.
"Even in success there's no scenario that 'Terra Nova' comes back this year for timing reasons. Whether it's 22 next year, contractually it's 22. Whether that's something we can ultimately do we're going to have to see."
Terra Nova will air every Monday until then except October 24 and December 5th.