I don't think the migratory bird seasons are set in stone till Sept.1. I have noticed that the Feds. usually go with the states proposed dates
The feds set a range of dates and a range of bag limits (conservative, moderate, or liberal) that flyways/states can hold their hunting seasons. It is up to the states biologists to choose the best dates for that particular state based on harvest potential, hunter satisfaction, and conservation. The states then propose those dates/ harvest back to the feds.
Most of the time if it is within the feds proposed date range- then its all good.