The registration start date is for an entire season. This is the first day that people can register for any session in a season. All sessions within a season are set to open at the same time in the Activation screen of Setup.

However, a registration end date can be different for each session. This is the last day that someone can register for a particular session. This is customized per session in the season's Setup.
  • Note: It is not enough to set the registration start date. A season must also be activated if participants should be able to register online. If a season is not also activated (even if the start date is in the future), then it will not become publicly available. For help with activation, use this article: Activating a Season