Hey there James,
Welcome to planDisney and thank you for your question! I'm thrilled to hear that you're planning to visit the Disneyland Resort during the week of Christmas - I can't think of many better ways to get in the holiday mood.
From what I've seen in past years during Christmas week, Disneyland Park has been open from 8:00 AM to 12:00 AM and Disney California Adventure Park has been open from 8:00 AM to 10:00 PM. Having said that though, these schedules are always subject to change.
Ultimately, I'd recommend keeping an eye on the
Hours & Events Schedule to see the official times once they're released. This schedule is available about six weeks from the current date so you'll want to wait until about mid-November to see the official schedule for your planned visit dates.
In the meantime, make sure to check the
Disney Parks Blog for all the news you need to know about what will be happening around the Merriest Place on Earth in December. The
Holiday season is packed full of so much extra Disney Magic! One of my favorite parts of this season is the
Disney Festival of Holidays around Disney California Adventure Park where you can learn more about festive holiday traditions celebrated around the world - and enjoy some delicious food and drinks as well!
Thanks again for your question, James! I hope you have a wonderful visit to the Happiest Place on Earth.
Have a Magical Day,
Greg