Surface, distance, and season
High school cross country races are almost always 5k; college adds 6k and 8k for women and 8k or 10k for men, all over grass, dirt, and hills that vary meet to meet. Track distance events run from 800m up to the 5000m on a measured, rubberized 400m oval with no elevation change. Cross country happens in the fall; track happens in spring, which is why most distance runners think of the two as halves of one season rather than separate sports.

