Just got this email from them:
We're Opening Early!
Whistler Blackcomb is opening ahead of schedule on Saturday, November 22. The decision to kick off the winter season early was made possible after natural snowfall at higher elevations was followed by a streak of below average temperatures, providing prime conditions for snowmaking. Whistler Mountain will open with five lifts running. Guests will have the option to upload from either the base of Whistler Mountain via the Whistler Village Gondola, featuring brand new cabins, or the Creekside base via the Creekside Gondola. Get the Details on Opening Weekend »