Boom! There will be snow somewhere, go find it. Some seasons resorts open a week or two into november, some seasons it has been as late as the first week of december. In my experience, Baker generally has the most consistent snowpack the fastest. Baker is a long drive for a day trip from Seattle though. However, Crystal also has a gondola that tops out at around 6,000 or so ft, which allows them to have limited operations before a lot of other areas.