In the USA the high school girls hurdle height is 33 inches.
High school women's 300 meter hurdles are set to 30 inches, while women's 100 meter hurdles are set to 33 inches!
Jr. High girls run 100 meter 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.
This is what I found for 80 metres hurdles Girls U13: 12.1 seconds
There are 7 hurdles in the 75 meter hurdle run.
In high school the 300mH (both genders) and 110mH (boys) or 100mH (girls). At the Collegiate level and beyond, the 110mH and 100mH are still run, but the long hurdles distance increases to 400mH.
Lashinda Demus of Long Beach Wilson High School, Long Beach CA set the National High School record in the 300 hurdles at the CIF California State Meet in 2001 at 39.98In 2011, she was the World Champion at 400 hurdles and won the silver medal at the 2012 Olympics.