[MysticBlue]

Depends on where you live and what you drive for. I am an essential worker... Staying home on snow days is not an option. I have snow tires mounted on another set of wheels sitting in my garage ready to slap on anytime I need. Doesn't take more than an hour or two. I live in Eastern Oregon and usually travel over the mountains for Thanksgiving, so the most common time that I put mine on is around the second week of November. If you don't plan on leaving Seattle, then I wouldn't worry about it until around the first week of December. If you have to take it in to a shop to change them, maybe sooner, to make sure you don't get caught in the rush when the first snow falls. I guess it depends on how dependent you are on this car and how important it is that you be able to drive it no matter the weather.