Hard to say. It’s still pretty warm out this way. There are some ski resorts that will produce man-made snow around Thanksgiving, but others will just wait for the snow to fall. Which will hopefully be happening soon! I’m guessing sometime in November.
I think it’s El Nino this year, so plan for a great season! I don’t know how often Tahoe resorts open early, but usually Northstar and Boreal are generally the first to open, so keep a close watch on their websites or follow them on Twitter.