https://www.gamespot.com/articles/fortnite-season-6-update-out-now-servers-live/1100-6462073/

[Update] The servers are now back online and Season 6 of Fortnite has begun. [Original Story] The next season of the popular battle royale game kicks off on PS4, Xbox One, PC, Nintendo Switch, and mobile today and it'll arrive alongside the release of the game's 6.0 update. The Fortnite servers have been taken offline so that developer Epic Games can issue the new patch and get the season rolling.

As previously revealed on Twitter, Fortnite servers will be down from 1 AM PT / 4 AM ET / 9 AM BST while Epic rolls out the game's 6.0 update. The developer didn't provide an estimate for how long this downtime will last; previous maintenance periods have typically run between one and two hours, though the timing could vary, particularly as patch 6.0 will presumably make some rather significant changes to the game.