Here is the official information from the Disney Park Reservation page:
The 4 Walt Disney World theme parks are now open!
To manage attendance during this reopening period, while also helping Guests plan ahead before their arrival, we are introducing the new Disney Park Pass system. During this time, all Guests with valid admission are required to make a reservation in advance for each park entry, using this new online tool.
To enter a park, both a park reservation AND valid admission for the same park on the same date are required for each person in your party ages 3 and up (limit one park per day). Acceptable face coverings must be worn over your nose and mouth at all times except in designated areas. If you’re unable to do this, please reschedule your Walt Disney World visit to a later time.
Please review any advisories or restrictions in place for travel to Florida, and do not travel to or enter Walt Disney World Resort unless you are free of any COVID-19 symptoms and otherwise comply with the requirements of such advisories and restrictions. Learn more.
Booking Your Park Reservations
The Disney Park Pass system is now open to Guests with valid admission. The number of theme park reservation days you can hold at one time varies based on your plans:
- Disney Resort and other select hotel Guests can make park reservations for dates during their stay for the number of days that they have valid theme park admission.
- Annual Passholders can make theme park reservations for up to 3 days at a time, and for their length of stay if staying at a Disney Resort or other select hotel.
- Existing ticket holders can make reservations for the number of days of valid theme park admission.
Park reservations are available for arrivals through the end of 2021, based on your vacation package and ticket eligibility or ticket eligibility window.
If you booked a vacation package, your ticket eligibility is tied to your package travel dates. To make a park reservation for a different date, be sure to modify your vacation package dates.
If you have a room-only reservation at a Disney Resort or other select hotel, please call the Disney Reservation Center or call your travel professional to upgrade to a vacation package with tickets—and then make your theme park reservations.