We were there the 3rd week in October last year. Crowds were moderate, much busier than September, but not summer crowds either. Manageable if you went early and used fast pass. MK closed early several days due to the Halloween party, but was open til 8 and 9 other nights, even 11 on Saturday. MGM closed at 7:30 I believe. It was quite HOT over half the time, upper 80's and quite humid. A couple of the other days were perfect. Overall a very nice time to go.