What is the middle school record for 400 meter race?

As of my last update in July 2022, the national middle school record for the 400-meter race, set at the AAU Junior Olympics, is 46.93 seconds. However, please note that this information might be outdated and new records may have been set since then. For the most up-to-date information, I recommend checking official athletics databases such as the National Scholastic Athletics Foundation (NSAF), the National Federation of State High School Associations (NFHS), or national athletic governing bodies like USA Track & Field (USATF).