They seem to release them at 60 days out, just like advanced dining reservations. If you want a hint just google disney world (ex magic kingdom) hours dec 2021 and you'll find fan sites that show it.
Depending when you’re going in December, be aware that changes are often made to opening hours a week ahead or even l as than that. Between Christmas and New Year these can be as late as the night before for earlier openings.
For sure! I wouldn’t put much stock in any previous schedules anymore. Too much going on that affects schedules and last minute changes are extremely common.
I miss the days of nearing park closure and hearing the surprise announcement come on… “Greetings guests of Magic Kingdom. We hope you’re enjoying your day. For your added enjoyment the Magic Kingdom will stay open an additional 2 hours tonight……”.
Those were the days.
To add: per the website the last full week of November isn’t even updated. They appear to literally be going at a rolling 60 day mark.
Also, correct me if I’m wrong but didn’t they extend early entry to a full hour approaching Christmas Day. I wonder if that’s possible again this year.