The 400 hurdles does not just get faster or slower with age. The barrier itself moves. Boys and open men race 36 in, women race 30 in, international U18 boys race 33 in, masters men drop to 33 in at 50, and from 60 the men's race stops being 400 meters at all. Any table that hands you a 400mH time without naming the height is telling you half the story. Here is the ladder with the height stated on every row. The sprint hurdle races run their own age ladder in average hurdle times by age.
USATF runs the 400mH in its 15-16 and 17-18 divisions at 36 in for boys and 30 in for girls, the same as the open race. World Athletics is different: U18 boys race 84.0 cm, which is 33 in, which is why world U18 bests are listed separately at that height. Every barrier height in the sport sits in one table in hurdle height by event and age.
Because the NFHS championship event is the 300, most American 400mH fields below college are small and self-selected. That makes any published average unreliable in a way a 100m average never is. The high school race and its own age ladder are covered in average 300m hurdle time by age, which is the page most US high schoolers actually want. Level by level, what counts as a good 400m hurdle time covers the same event from the other direction.
Masters men stay at 36 in through M49, drop to 33 in for M50-M59, and from M60 race a 300mH over 30 in barriers instead. Masters women race the 400mH at 30 in through W49, then move to the 300mH. Times across those boundaries are not comparable, and neither WMA nor USATF publishes an age-group average to lean on.
Takeoff distance and trail leg mechanics both change with the barrier height, so generic hurdle feedback is close to useless in this event. Film one clearance at the height you actually race and AI grades it against that specific standard.
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Times in seconds, fully automatic. Rows marked estimate are our own bands built from published results, because no governing body publishes an average for this event. Everything else is a published standard, a championship result or a record.
| Age / level | Barrier height | Men / boys (s) | Women / girls (s) |
|---|---|---|---|
| USATF 15-16 division | 36 in boys, 30 in girls | 58.0 - 68.0 (estimate) | 68.0 - 80.0 (estimate) |
| USATF 17-18 division | 36 in boys, 30 in girls | 54.0 - 62.0 (estimate) | 63.0 - 72.0 (estimate) |
| U18 international, age 16-17 | 33 in boys, 30 in girls | 52.0 - 56.0 (estimate) | 60.0 - 66.0 (estimate) |
| US high school record | 36 in, 30 in | 49.38 (2002) | 53.82 (2017) |
| NCAA Division III qualifier | 36 in, 30 in | 53.0 - 56.0 (estimate) | 62.0 - 66.0 (estimate) |
| NCAA Division II provisional standard, 2026 | 36 in, 30 in | 53.06 | 61.87 |
| NCAA Division I champion, 2021-2025 | 36 in, 30 in | 47.23 - 48.70 | 52.46 - 54.68 |
| World Championships entry standard, 2025 | 36 in, 30 in | 48.50 | 54.65 |
| World record | 36 in, 30 in | 45.94 (2021) | 50.37 (2024) |
| Masters M35-M49 and W35-W49 | 36 in men, 30 in women | 55.0 - 70.0 (estimate) | 65.0 - 85.0 (estimate) |
| Masters M50-M59 | 33 in | Barrier drops 3 in, no published average | W50 and over race the 300mH |
| Masters M60 and over | 300mH over 30 in | The 400mH is not contested | The 400mH is not contested |
Common questions athletes and coaches ask about this topic.
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