Steam Sale Dates have been leaked in a lot of places. The most trustable of all sources is Steam Database on Twitter. They usually leak most of the stuff going at Steam. Steam Database says that “Multiple developers posted it in multiple places despite Valve asking otherwise. But you know how that goes”
The Dates are quite believable in my opinion, perfectly suited for the standard. Enjoy the sale!
Halloween Sale: October 28 – November 1
Autumn Sale: November 26 – December 3
Winter Sale: December 19 – January 2