The fan page about Horror Nights 2014 Reports the following:
"Here are the expected dates for Halloween Horror Nights 2014:
September: (Employee Preview) 17th, All Guests: 19th, 20th, 21st, 25th, 26th, 27th, 28th
October: 2nd, 3rd, 4th, 5th, 9th, 10th, 11th, 12th, 15th, 16th, 17th, 18th, 19th, 22nd, 23rd, 24th, 25th, 26th, 30th, 31st,
November: 1st"
I would not be surprised if they got the dates correct.