Starting on Saturday, February 17, 2018, the Zion Canyon Shuttle will begin running on weekends until the full Zion Canyon shuttle service begins for the season on March 10, 2018.
The Springdale town shuttle is not expected to begin operating until the construction on SR-9 is closer to completion.
During the times that the Zion Canyon shuttle is in operation, the main canyon in Zion National Park will be closed to cars. This shuttle will run throughout the day from the visitor center to the Temple of Sinawava, making stops at various trailheads every 7-10 minutes.
Parking is available at the visitor center, though it is limited. There is occasionally a private shuttle van that operates throughout Springdale for a small fee, to take you to and from the park entrance. As soon as I can confirm that they will be operating, I will post information about this service.