Hi Ashlee!
Thanks for reaching out to the Moms Panel!
The answer to your question is simply "YES!" If you're driving in on the day of your arrival, you will be allowed to park at your
resort hotel even before your check-in time. When we drive to
Disney, we do this all the time and it's never been an issue. Sometimes, we've arrived as early as 6AM or 7AM on the day of arrival and still could park.
The good news is although your room will likely not be available that early, once you're checked in you can begin to enjoy all the amenities at the resort hotel! Or, what we've also done, is once your
MagicBands are activated and you have park admission, you can head straight to a
theme park and come back later if you wish. Bell Services will also keep your luggage stowed away until your room is ready if needed.
So yes, come early if you need, and have a magical time at
Disney!
Terry