How reliable are EMH dates 6 months out?

[KrazeeK120]

My family and I are going to Disney the 2nd week of May next year. I'm a little over a week out from my ADR date. I'm sure park hours will change, and I'm not looking for any PPO breakfasts. I am, however, trying to schedule around EMH (I like to avoid EMH parks if I can). How reliable are the EMH dates this far in advance?

 

[Robo]

The early-posted EMH dates can change...
but not NEARLY as much as the early-posted HOURS will change.

EMH dates will generally remain as posted, but you need to frequently check, re-check and check again as your trip approaches.