Disneyland in Anaheim, California, officially opened on July 18, 1955, after a preview event on July 17, 1955. The park is open year-round with daily operating hours generally from 8:00 AM to 12:00 AM, though these hours can vary depending on the season and special events. Guests can enter the resort area as early as 7:00 AM for security checks, with park gates typically opening around 7:30 AM, allowing early park entry especially for hotel guests who get certain ride privileges before regular opening hours.