Regarding your edit. You cannot drive up this time of year, as the road closed a few weeks ago. Also for what it is worth, hiking Mansfield in freakishly warm November weather is very different from hiking Washington in weather that might be nowhere near as warm. Washington is far more exposed for far longer, and temperatures can get much colder/windier than anything Mansfield can get.

I also did some hiking last week, it was basically summer temperatures up in the mountains. Now that the weather is changed it could be a whole different hike, and could be pretty serious.