As we know that Season three of Stranger Things released on July 4th, 2019. Netflix has announced that Stranger Things would be returning for a fourth season on September 30th, 2019.
We know that filming for Stranger Things season 4 began on January 7th, 2020. But it was stopped for coronavirus pandemic.
On June 18, 2020, we got confirmation that the full script had been done for Stranger Things season 4.