This is the standard route up from the North Cottonwood trail up the south slopes. It is only slightly tricky the last 20-40 feet. I would say that the ledge system is class 3, but then again I have never seen that written anywhere. It is a very short section and dumps you on the summit I remember thinking, well...guess I will head over to Columbia cause I don't really want to go back down the ledges.
Harvard is a very enjoyable mountain. Hike in to treeline and camp and get both the next day.