The only race for hurdles in middle school is the 100m hurdles.
The 300m hurdles race is run in high school track and field (once in college the race is 400m hurdles). For the girls' race, the hurdles are 30 inches high - for the boys' race, the hurdles are 36 inches.
Both men's and woman's 300m hurdles races have 8 hurdles in them. However, the 300m hurdle race is not run professionally or in collegiate competition. Instead, the 400m hurdles is run, with 10 hurdles.
The hurdles in the 400m race are 36 inches high. The hurdles in the 110m race are 42 inches high.
there are six hurdles in a 60m hurdles race.
In high school, the 400m hurdles race becomes the 300m hurdles, although some high school hurdlers also compete at the 400m level. Here are the distances for both: 300m hurdles: To first hurdle:45m; 147' 9" In between hurdles: 35m; 114' 9" Last hurdle to finish line:10m; 32' 10" 400m hurdles: To first hurdle:45m; 147' 9" In between hurdles: 35m; 114' 9" Last hurdle to finish line:40m; 131' 3"
There are 10 hurdles in a 110m hurdle race.
hurdles is where people run in a race trying to beat the others to get to the first while jumping over meter high hurdles or obstacles
Strictly speaking there are no hurdles in a 400m race, but in a 400mH race there are ten hurdles per lane.