When does season 3 star vs the forces of evil come out?
The second season premiered on July 11, 2016, The show's third season was ordered ahead in March 2016. It premiered on July 15, 2017, with a two-hour long television movie entitled ""The Battle for Mewni"" and consisted of the first four episodes. A live chat featuring Star and Marco was aired on Disney XD on July 17. The remaining third-season episodes started airing on November 6, 2017. A fourth season was also ordered ahead of the third season premiere. That fourth season, announced to be its last in February 2019, premiered on March 10, 2019, with two episodes.
When does season 3 star vs the forces of evil start airing?
July 15, 2017
Star vs. the Forces of Evil
No context provided
Over what time span does season 3 star vs the forces of evil come out?
July 15, 2017 - April 7, 2018
Star vs. the Forces of Evil
https://en.wikipedia.org/wiki/Star%20vs.%20the%20Forces%20of%20Evil
Star vs. the Forces of Evil is an American animated magical girl television series created by Daron Nefcy and developed by Jordana Arkin and Dave Wasson, which aired on Disney Channel and Disney XD
Star vs. the Forces of Evil
Greenlit for Disney Channel in 2013, the first episode aired there on January 18, 2015, as a preview, then the series moved over to Disney XD on March 30, 2015, where its premiere on Disney XD became the most-watched animated series debut in the network's history. 
Star vs. the Forces of Evil
The series ended on May 19, 2019, with the episode "Cleaved".
Star vs. the Forces of Evil
Star vs. the Forces of Evil is an American animated magical girl television series  which aired on Disney Channel and Disney XD.  Greenlit for Disney Channel in 2013, the first episode aired there on January 18, 2015, as a preview, then the series moved over to Disney XD on March 30, 2015. Season 3 ran from July 15, 2017 - April 7, 2018.  The series ended on May 19, 2019.