The Christmas decorations at Disneyland typically go up in early November, but the exact date varies from year to year. You can expect to see the festive lights, trees, and other decorations throughout the park, and the holiday season often includes special events and activities like holiday parades, live shows, and character meet-and-greets. So, if you're planning a visit to Disneyland during the holidays, be sure to check the park's website or social media pages for the latest information on when the decorations will be up and what special events will be happening.