We're thinking of camping during the week in early October. Do you think it will be full? We would arrive Sunday evening.

I think you'll have your choice of sites.

You'll probably be okay arriving Sunday evening. Most people will vacate their camp site Sunday afternoon.

No, it will likely not have any one there. We went on a Sunday in August 2018 and the campground was only a quarter full.

I think not since its not a holiday also since its Sunday most people already left

This campground is the last to fill up along Rampart Range road, so you'll likely be fine.