First off, major credit to @Joveus and @TTV_Viytalic for their work on compiling the correct order all the books and games take place in. As such, much of this list is taken verbatim from their posts.
(Source: @Joveus Gears of War Timeline (Playing and reading order guide for games, books and comics))
Again, huge thank you for providing that list. However, it is fairly outdated now, hence why I am creating this thread.
If I got anything wrong, please bring it up so I can edit it. Unfortunately, the writers don’t provide specific dates for this new saga, so getting an exact timeline is difficult, but I did my best, based on the events in the book/game, and what events it references. Now, with that preface out of the way, here’s the list. Hopefully it comes in handy for one or two of you.
17 BE — Anvil Gate (Ch 5-17)
17 BE — They Also Serve
17 BE — Anvil Gate (Ch 19)
17 BE — Unseen
12-9 BE — Aspho Fields (Ch 5)
4 BE — Unsaid
3-2 BE — Aspho Fields (Ch 6-19)
0 BE — Bloodlines (flashback)
0 BE — Promise Me
0 BE — The Rise of RAAM
0 AE — Coalition’s End (Ch 4, 7 & 11, Cole segment)
0 AE — Gears of War: Judgment | Kilo Squad: The Survivor’s Log
0 AE — Coalition’s End (Ch 11, Dizzy & Bernie segments)
1 AE — Jacinto’s Remnant (Ch 3, 6, 9, 1st Dom segment)
1 AE — Coalition’s End (Ch 14, 1st Dizzy segment)
1 AE — Jacinto’s Remnant (Ch 9, Hoffman & 2nd Dom segments)
1 AE — Jacinto’s Remnant (Ch 13)
1 AE — Coalition’s End (Ch 14, 2nd Dizzy segment)
1 AE — Jacinto’s Remnant (Ch 15)
1 AE — Coalition’s End: (Ch 17)
2 AE — Gears Tactics
9 AE — Coalition’s End (Ch 20)
9 AE — RAAM’s Shadow
10 AE-14 AE — The Slab
14 AE — Gears of War: Ultimate Edition
14 AE — Aspho Fields (present chapters)
14 AE— Hollow
14 AE — One Day
14 AE — Barren
14 AE — Midnight
14 AE — Gears of War 2 (Acts 1-3)
14 AE — The Quickening
14 AE — Gears of War 2 (Act 4)
14 AE — Harper’s Story
14 AE — Gears of War 2 (Act 5)
14 AE — Dirty Little Secrets #1
14 AE — Jacinto’s Remnant (present chapters)
15 AE — Anvil Gate (Ch 1-3)
14 AE — Dirty Little Secrets #2
15 AE — Anvil Gate (Ch 4-20)
15 AE — Coalition’s End (Ch 1-19)
15 AE — Dirty Little Secrets #3
15 AE — Coalition’s End (Ch 21-23)
15 AE — Dirty Little Secrets #4-6
17 AE — Gears of War 3 (Acts 1-3)
17 AE — Aftermath (Ch 1 & 2)
17 AE — Gears of War 3 (Act 4)
17 AE — Aftermath (Ch 3 & 4)
17 AE — Gears of War 3 (Act 5)
42 AE — Gears of War 4
42 AE — Ascendance
42 AE — Gears 5 (Act 1)
42 AE — Bloodlines (present chapters)
43 AE — Gears 5 (Act 2)
43 AE — Gears 5: Hivebusters
43 AE — Hivebusters (comic)
43 AE — Gears of War 5 (Acts 3-4)