Welcome to planDisney, Arath! 
Thank you for dropping by with your question about park hopping at the 
Disneyland Resort! 
Here’s how it works! An advanced 
Theme Park Reservation is required in addition to your valid theme park admission. Reservations are currently being accepted up to 180 days in advance. Pick Disney California Adventure Park as your starting theme park, and then you are welcome to hop to Disneyland Park after 11:00 a.m. on the day of your visit. You are not required to make an additional park reservation to visit the second park or hop back and forth between the parks. But, as always, theme park admission is subject to attendance availability. 
So, you don’t have to choose between a Dole Whip from 
The Tropical Hideaway in Disneyland Park or a sundae from 
Ghirardelli Soda Fountain and Chocolate Shop in Disney California Adventure Park!  
Enjoy your time at the Disneyland Resort and head back to planDisney with more questions! 
Tiffanie