A tweet from
the Steam Database
posts what they say are the dates for the next three
Steam sales. They say these come from multiple sources ignoring Valve's hopes
for a degree of confidentiality that these sales almost never enjoy. That said,
none of this is officially confirmed:
@steam_games 2019 sale dates:
🎃 Halloween Sale: October 28 - November 1
🍂 Autumn Sale: November 26 - December 3
🎅 Winter Sale: December 19 - January 2
Multiple developers posted it in multiple places despite Valve asking otherwise.
But you know how that goes.