It will depend on what closure phase they are in.
Here is the break down...
Phase 1
Guests with 'Magic Your Way' base tickets, or a '1-Day 1-Park Ticket', Guests without an admission ticket, and Cast Members using Main Gate & Silver Passes will be turned around at the parking lot booths.
Phase 2
Admission is limited to:
- Disney Resort Guests (including the Walt Disney World Swan and Dolphin, and guests arriving by bus from the Hotel Plaza Boulevard hotels)
- Annual and Premium Annual Passholders
- Guests with Hopper tickets coming from another park
- Guests re-entering the park
- Guests with dining reservations
- Magic Kingdom Guests with reservations for Bibbidi Bobbidi Boutique or The Pirates League
- Guests using Walt Disney World Resort Transportation will be admitted.
Phase 3
Admission is limited to:
- Disney Resort Guests (including the Walt Disney World Swan and Dolphin, and guests arriving by bus from the Hotel Plaza Boulevard hotels)
- Annual and Premium Annual Passholders
- Guests with dining reservations
- Magic Kingdom Guests with reservations for Bibbidi Bobbidi Boutique or The Pirates League
Phase 4
Closed to all guests.
The park will go in and out of those 4 different phases during the day (phase 4 is incredibly rare). If you have AP, are staying on property or have a dining reservation, you will be good to go all the way up to a phase 4.