Lisa:
I have been fortunate to have have harvested 2 nice billys in my home state of Washington. I like the later season because the goats have longer hair, and thus make a wall mount a whole lot more attractive. You do have to watch the weather like a hawk because you can be snowed out quickly. Check the weather patterns over the last 10 years or so. If you think you'll be ok
with mid Oct, I'd go with it. Also, Billys rut in Nov, so that
may be a plus. Good luck, and be carefull up there. Having been
there hunting these critters in some dangerous terrain, no goat is worth getting killed for. Be sure to get some good pics for us all! If you have any questions, send me a pm.