November is usually no problem, and in fact pretty nice weather on the Moutain. Jan. / Feb. / March can still be on the cool side, but no problem if you dress for it.
There is one little place where a stream runs across the roadway, which can (and does) freeze. Thankfully, it's so short that even if you lose traction, you get it back on the dry pavement before you can fall . . . at least that's my experience.
Rick / OCRR