The Gears of War series first game was Gears of War released on 7th November 2006.
2006
Gears of War
7th November 2006
2008
Gears of War 2
7th November 2008
2011
Gears of War 3
20th September 2011
2013
Gears of War: Judgment
19th March 2013
2015
Gears of War: Ultimate Edition
25th August 2015
2016
Gears of War 4
11th October 2016