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- The human colony of Eridanus II is glassed by the Covenant.
- Rani Sobeck is born.
- Jake Courage's photo exhibit Killing Time wins the John Pilger Prize.
- The Assembly discusses the losses in the Human-Covenant War so far, as well as the possibility of re-terraforming glassed human worlds. To prevent human extinction, they also decide that they must be more open with their actions.
- Thrust assemblies are replaced on the UNSC Spirit of Fire from the scuttled UNSC destroyer Calcutta.
- SPARTAN-II Blue Team shuts down the United Rebel Front's Station Jefferson in the Eridanus system.
- Blue Team destroys, captures or otherwise eliminates the URF destroyer Origami sometime prior to November.[note 1]
- Blue Team eliminates a URF high-explosive manufacturing facility at an unspecified location sometime around November.
- Blue Team disrupts URF activity in Micronesia and breaks up a saboteur ring on Reach between November of this year and May 2531.
- January 7: Serina is created by Daedalia Technology and assigned as the UNSC Spirit of Fire's AI.
- January 30: Kat-B320 is born in Monastir, New Harmony.
- February 7: Indrid Lota is born in the human world of Aleria.
- July 9: Holly Tanaka is born on the human Outer Colony of Minab.
- August 17: Sergeant John Forge is incarcerated for assaulting Lieutenant Prosser.
- October 19: Anthony Madsen is born on New Llanelli.
- October 20: Michael "Mickey" Crespo is born in Crisium City, Naniwa, on Luna.
- November: James Cutter, captain of UNSC Spirit of Fire, decided to give his executive officer, Terrence Hood, command of the UNSC Roman Blue.
- December 24: The Battle of Groombridge-1830 takes place, resulting in a costly UNSC victory.
- December 25: Subject 386 is interrogated by Fleet Admiral Preston Cole and First Lieutenant Richard Lionel Barclay. The interrogation is recorded by the AI Solipsil.
- ^ Incidents were listed off in chronological order, and this fell between two incidents that year and six months prior to May 1, 2531.
- ^ Halo: The Fall of Reach
- ^ Axon Brain ninjas.ogg
- ^ Xbox.com - Jake Courage Exhibition (defunct)
- ^ Halo: Reach, Data pad 14
- ^ Halo Wars: Genesis
- ^ a b c d Halo: Ghosts of Onyx, pages 36-37
- ^ Halo: The Essential Visual Guide, page 170
- ^ Bungie.net: Halo: Reach Project Page - Kat's profile
- ^ Halo: Nightfall, ONI: Trade Barriers
- ^ Halo Waypoint: Holly Tanaka
- ^ Halo Wars Timeline Events
- ^ Halo 4: The Essential Visual Guide, page 23
- ^ Halo: Escalation, Issue #5
- ^ Halo: The Fall of Reach (2010), Adjunct