we have checked into a disney resort as early as 9 am. no problem. of course, it doesn't mean your room will be ready. while we often have our room ready very early, we have had to wait for it, too. (some people check out very early, like we have at 6 AM when driving, of some stay untill the 11 am mandatory check out time, as we have when flying) but even if your room isn't ready, you get your park tickets, etc. and can store y our luggage, and you canuse the pool and everything else.