Greetings, Ethan. Thanks for cruising by planDisney!
While there isn't a posted closing time for the
Disneyland Resort Parking Areas, the trams to and from the Mickey & Friends Parking Structure and the Pixar Pals Parking Structure, and the busses to the Toy Story Parking Area stop running one hour after the latest theme park closing time. This includes nights with Special Events, like Grad Nite, so it is likely that the Parking Areas would close around that time as well.
Ethan, I recommend checking with a Cast Member at the Parking Area once you arrive. They should be able to let you know exactly what time the parking areas close and where to park to meet your needs.
I recommend downloading the
Disneyland Mobile App before your arrival, as it has a handy
Car Locator function that allows you to input the exact location of where you parked. After a long night of chaperoning students, the last thing you want is to forget where you parked! To use the Car Locator, tap the magnifying glass/search icon in the app's home screen and type "Car Locator."
I hope this information helps, Ethan. Please visit us again with any other questions!
See ya real soon,
Melissa