Swimmers must check in for events 400 yards or longer. Swimmers, or their coaches or teammates on their behalf, may check in online by the deadlines below. Failure to check in will result in the swimmer being scratched from the event. The swimmer won’t be permitted to swim that event at another time.

The check-in deadline is 7 p.m. Eastern time the day prior to the event (rather than 7 a.m. the morning of the event in previous years) so swimmers can be better prepared when they arrive at the pool. Heat sheets will be posted online by approximately 8 p.m. Eastern time the night before each distance event.