Hi Steve! Thanks for visiting planDisney.
Good news! You only need
theme park reservations for the park you're starting in, not the one you'll be hopping to later in the day. I checked
availability for you, and both parks are still available. However, Halloween Time at the Disneyland Resort is an incredibly popular time to visit thanks to the festive decor, merchandise, entertainment, Attraction overlays, and more. It is possible for a day or a park to fill up, which would be a not-so-magical outcome for your park day! So, please make your theme park reservation for your starting park as soon as possible. You'll need it for entry along with your valid admission ticket.
You'll love the flexibility of a
Park Hopper. We like to start our day in one park, stay through lunch, and then hop to our next park. Then we'll hop back to our starting park for dinner and nighttime entertainment. You can do that! No additional theme park reservations are needed to experience all the fun in the way you prefer.
That's our preferred way to explore the parks, along with
Lightning Lane Multi Pass, which allows Guests to spend less time waiting in queues, so they can experience all the magic of the season. If you don't have Lightning Lane Multi Pass on your tickets already, you can purchase it using the
Disneyland mobile app after you've scanned into the parks. You should see the banner for purchase at the top of the home screen subject to availability. Prices vary by date.
I hope this helps!
Elizabeth