if you plan to book any of the popular dining places you better start at the earliest time possible to get reservations. That includes peak and off peak times.
The window to start making reservations varies depending on whether you are staying at a Disney World property or at an off-property location. If you are staying at a Walt Disney World Resort hotel, you can begin making your Advance Dining Reservations 180 days before check-in plus up to 10 days of your on-property stay. This means that Disney Resort hotel Guests who are staying for 10 days can make reservations for the last day of their trip 190 days in advance, rather than just 180 days in advance.
With that extra !0 day option makes it slightly easier to get those hard to get dining options.
There are several options for making your dining reservations through My Disney Experience either online or the My Disney Experience App. Lasly you have the option of calling Disney Dinning Reservations directly.
I hope this helps with your planning,
As always if you have any other questions please feel free to contact me at WDWTripAdvice@gmail.com