Wednesday 03 Jul Early Close
Thursday 04 Jul Independence Day
Monday 02 Sep Labor DayThursday 28 Nov Thanksgiving Day
Friday 29 Nov Early Close Tuesday 24 Dec Early CloseWednesday 25 Dec Christmas Day
Note: Each market will close early at 1:00 p.m. on Wednesday, July 3, 2013, Friday, November 29, 2013 and Tuesday, December 24, 2013. Crossing Session orders will be accepted beginning at 1:00 p.m. for continuous executions until 1:30 p.m. on this date.
Source: http://www.nyse.com/Frameset.html?displayPage=/about/1022963613686.html