2013

February

 * February 18: The first season of Spartan Ops ends.
 * February 25: The Majestic Map Pack is released.

March

 * March 19: Halo: Silentium, the third and final novel of the Forerunner Saga, is released.
 * March 29: Forge Island is released.

April

 * April 8: The Castle Map Pack is released.
 * April 9: Halo 4: Original Soundtrack Volume 2 is released.

May

 * May 21: Halo: The Television Series is announced for the Xbox One in Microsoft's keynote conference.
 * May 27: The Halo 4: Forward Unto Dawn Deluxe Edition Blu-ray/DVD Combo is released for Region 2.

June

 * June 10: Halo Xbox One is announced at E3 2013.
 * June 21: Microsoft announced that the Reclaimer Trilogy was expanded into the Reclaimer Saga.

July

 * July 10: Halo 4: Forward Unto Dawn Original Soundtrack is released.
 * July 18: Halo: Spartan Assault and its soundtrack are released.

August

 * August 14: The first issue of Halo: Initiation is released.
 * August 17: The machinima/live-action series Arby 'n' the Chief ends with its seventh and last season.
 * August 20: The Bullseye Map Pack, Infinity Armor Pack and Steel Skin Pack are released.
 * August 29: Operation F: Hydra is released as a title update for Halo: Spartan Assault.
 * August 30: An Emile-A239 figure made by ThreeA was released.

September

 * September 11: The second issue of Halo: Initiation is released.
 * September 16: Halo 4: The Essential Visual Guide is released.

October

 * Unknown date: The second series of Halo 4 McFarlane Toys is released.
 * October 8: Halo 4 Game of the Year Edition is released.
 * October 9: The third and final issue of Halo: Initiation is released.

November

 * November 6: Halo Waypoint releases Halo 4: A Look Back on Halo 4 ' s one year anniversary.

December

 * December 6: The Halo 4: The Master Chief limited-edition statue is released by McFarlane Toys.
 * December 11: The first issue of Halo: Escalation is released.
 * December 23: Halo: Spartan Assault is released on Xbox One.