Yes, Disneyland Resort in California continues to use a Theme Park Reservation system in 2026, and reservations do frequently run out, especially during peak periods. Unlike Walt Disney World in Florida, which has loosened its reservation requirements for many guests, Disneyland maintains the system to strictly manage the high local demand in Anaheim. Reservations for "General Admission" tickets typically fill up during holiday weeks (like Christmas and Spring Break), holiday weekends, and during the opening month of a major new attraction or festival. Magic Key holders (annual passholders) face even tighter availability, as Disney allocates a specific, limited number of reservations for them, which can often book up weeks in advance for Saturdays and Sundays. To check the current status, guests must visit the "Theme Park Availability Calendar" on the Disneyland website before purchasing tickets. If a date is "greyed out," it means no more reservations are available for that park on that day. However, it is always worth checking back frequently, as guests often cancel their plans at the last minute (usually by 11:59 PM the night before to avoid a "no-show" penalty), which can cause spots to unexpectedly reappear in the system.