This was a great training trail for the Colorado Trail segments I am hoping to do next year. Good length, lots of up and lots of down. I found the intense steepness of the stairs a bit intimidating but I got through it. I went midweek and only saw a handful of bikers and trail runners. I started late this time and wanted to get back to car before dark, but next time I will definitely leave early enough to enjoy time near the So. Boulder Creek. For me, it was moderate to hard. Will definitely do it again.