Season 3: Oct 15
https://trekmovie.com/2020/07/27/breaking-star-trek-discovery-season-3-will-debut-in-october/
This morning, CBS announced that season three of Star Trek: Discovery debuts on the streaming service Thursday, October 15th. The 13-episode season will be available on-demand weekly on Thursdays on All Access, with the season finale dropping on January 7, 2021.
The October 15 start date for Discovery is exactly one week after the 10-episode first season of the new animated comedy Star Trek: Lower Decks wraps up. This means fans will have 23 consecutive weeks of new Star Trek on CBS All Access starting on August 6th when Lower Decks debuts.
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CBS: After following Commander Burnham into the wormhole in the second season finale, season three of STAR TREK: DISCOVERY finds the U.S.S. Discovery crew landing into an unknown future far from the home they once knew. Now living in a time filled with uncertainty, the U.S.S. Discovery crew, along with the help of some new friends, must work together to restore hope to the Federation.