Ghiz met with the Liberal caucus just before the announcement. He said he would stay on until there was a leadership convention, expected early in the new year.
Ghiz said that he was leaving at a time when he was proud of his government's record, and that he had faith in the team he had built.
The premier said he had no plans apart from more time with his family. He said he did not have any current intention to run federally, but he did not rule it out in the future.