Trail Dog,
I’ve done many October hikes in the Smokies, and suggest you be prepared for a wide variety of weather…some of the wildest swings in temp and precip that month. It’s well-worth the trip though…my favorite month there.
You will definitely need reservations year-round. You’ll have company, especially on the AT. Other side trails are also worth the walk too (my favorite loop there is out of Big Creek to Mt Sterling, Balsam Ridge to Tricorner Knob (on the AT), Snake Den to Cosby to Mt Cammerer via lower Mt Cammerer and AT, then retrace to Big Creek viaChesnut Branch trail.
But if you do your section, I agree with Fritz. Skip Mt Mommas and park at Big Creek ranger station. There have definitely been reports of car vandalism near Davenport Gap.
Have a great hike.
Scorch
Scorch