Yes, you can park hop as many times as you like between Disneyland Park and Disney California Adventure in a single day, provided you have a Park Hopper ticket or a Magic Key (annual pass). In 2026, the park hopping rules are quite flexible: you must first enter the park for which you have your initial reservation. After that, you are free to "hop" to the other park at any time after 11:00 AM. Once you have scanned into your second park, there is no limit to how many times you can go back and forth for the rest of the day. This is particularly useful for catching specific entertainment, like seeing a parade in Disneyland in the afternoon and then "hopping" back to California Adventure for World of Color at night. Always check the Disneyland app for "capacity" updates, though it is extremely rare for the parks to reach a level where hopping is restricted once the 11:00 AM window has opened.