2015

Real-world events

January

• January 18: The Halo 5: Guardians multiplayer beta ended.
• January 28: Issue #14 of Halo: Escalation was released.

February

• February 25: Issue #15 of Halo: Escalation was released.

March

• March 2: Halo: New Blood was released digitally.^[1]
• March 17: Halo: Nightfall was released on DVD and Blu-ray.
• March 22: Hunt the Truth Season 1 began.
• March 26: Issue #16 of Halo: Escalation was released.
• March 30: Both All Hail and The Cost, as part of the Hunt the Truth campaign, were released.

April

• April 16
  • Halo: Spartan Strike was released.^[2]
  • Halo: Spartan Assault was released for iOS.
• April 22: Issue #17 of Halo: Escalation was released.

May

• May: Halo 3: ODST and Remnant were added to Halo: The Master Chief Collection.^[3]
• May 27: Issue #18 of Halo: Escalation was released.

June

• June 14: Hunt the Truth Season 1 ended.
• June 15: The Halo 5: Guardians campaign was showcased at E3 2015.
• June 16: Halo: Hunters in the Dark was released.^[1]
• June 24: Issue #19 of Halo: Escalation was released.

July

• July 27: Halo: Saint's Testimony was released digitally.^[1]
• July 29: Issue #20 of Halo: Escalation was released.

August

• August 4: The Halo Wars 2 Announce Teaser was shown at Gamescom 2015.
• August 26: Issue #21 of Halo: Escalation was released.

September

• September 15: Halo: Last Light was released.^[1]
• September 22: Hunt the Truth Season 2 began.
• September 23: Issue #22 of Halo: Escalation was released.

October

• 27 October 27:
  • Halo 5: Guardians was released.^[4]
  • Halo: The Fall of Reach Animated Series was released.
  • The Art of Halo 5: Guardians was released.
  • Halo 5: Guardians Official Game Guide was released.
• October 28: Issue #23 of Halo: Escalation was released.

November

• November 12: The Xbox 360 version of Halo: Spartan Assault becomes backward compatible on the Xbox One.
• November 25: Issue #24 of Halo: Escalation was released.

December

• December 7: Halo: Shadow of Intent was released digitally.^[1]
• December 17: Halo: Reach becomes backward compatible on the Xbox One.

Unknown Date

• Spring: Halo Online entered closed beta stage.^[5]

Sources

1. ↑ ^{1.0 1.1 1.2 1.3 1.4} Halo Waypoint - Canon Fodder - Novel Ideas
2. ↑ Halo Waypoint - Halo: Spartan Strike released
3. ↑ Halo Waypoint - Blogs - A Thank You to Our Fans, from Bonnie Ross
4. ↑ IGN - Halo 5 Release Date Announced
5. ↑ Halo Waypoint - Blogs - Halo Online Closed Beta Launching in Russia