According to the "Climate" section on Wikipedia's Silverton page the average snowfall is 8.5 inches in October and then 20 inches in November. I therefore would say that, yes, end of October snow can be an issue at the Sultan Camping Area. https://en.wikipedia.org/wiki/Silverton,_Colorado#Climate

I live nearby. It has already snowed in the mountains. The nights are very cold. Daytime temps maybe reach 45-50. End of October is much too late to camp that high.

End of Oct 2020 we were in the area and they had a good snow the week before we were there so couldn't do much of the mountain trails we wanted. I'd be weary.

Probably not, I really think I won’t start snowing until at least late Nov.