Washington State Ferries Communications director Marta Coursey said Monday it may still have issues in sea trials or with crew training.
Officials had hoped to have it running on the on the Mukilteo-Clinton route with the beginning of the June 15 summer service schedule.
Coursey says it will be at least next week before the Tokitae is running.
It's the first of three 144-car ferries being built for the state by the Vigor Industrial shipyard in Seattle for $388 million for all three.
Tokitae is a Salish word meaning "nice day, pretty colors." It's also the name of a Washington orca better known as Lolita at the Miami Sequarium.