How tall are hurdles, and how far apart are they?

Men's 110m hurdles are 1.067 m (42 in), women's 100m hurdles 0.838 m (33 in). In the 400m hurdles men clear 0.914 m (36 in) and women 0.762 m (30 in). Every race has 10 hurdles.

Senior hurdle races
Race	Height	To first	Between	Last to finish
110m hurdles (men)	1.067 m	13.72 m	9.14 m	14.02 m
100m hurdles (women)	0.838 m	13.00 m	8.50 m	10.50 m
400m hurdles (men)	0.914 m	45 m	35 m	40 m
400m hurdles (women)	0.762 m	45 m	35 m	40 m

Spacing

In the 110m hurdles the first hurdle is 13.72 m from the start and the rest 9.14 m apart. In the 100m hurdles it is 13 m, then 8.5 m. In the 400m hurdles it is 45 m, then 35 m, for men and women.

Younger athletes and high school

U20 men race 0.991 m (39 in) hurdles and U18 boys 0.914 m (36 in). US high school boys run the 110m hurdles at 39 in and the 300m hurdles at 36 in; girls run 100m hurdles at 33 in and 300m hurdles at 30 in. The 300m hurdles has 8 hurdles: 45 m to the first, then 35 m apart.