Freshman in High School: 3rd notch for 110m and 300m Sophmore/Junior/Senior in High School: 4th notch for 110m and 3rd notch for 300m College/Professional: 5th notch for 110m and 4th notch for 400m...
By definition, the high hurdles refer only to the 110M (men's) and 100M (women's) races: Men's - 110m hurdles are 42 inches high Women's - 100m hurdles are 33 inches high