Half-Life/Portal - Timeline

[ThePMan]

The following is a detailed timeline of the Half-Life and Portal shared universe in chronological order. The media included and each of their respective chronological placements on this timeline are based on the unofficial Combine Overwiki timeline and canonicity guides. This is a work-in-progress timeline.

Playing/Reading/Viewing Order:
Turret Lullaby
Aperture Investment Opportunity #1: "Panels"
Aperture Investment Opportunity #2: "Bot Trust"
Aperture Investment Opportunity #3: "Turrets"
Aperture Investment Opportunity #4: "Boots"
Half-Life: Opposing Force Soldier's Handbook
Boot Camp
Hazard Course (Blue Shift)
Hazard Course (Half-Life)
Half-Life: Decay
Half-Life: Blue Shift
Half-Life
Xen Attacks
Half-Life: Opposing Force
Portal
Portal 2: Lab Rat
Half-Life: Alyx
Half-Life 2
Half-Life 2: Episode One
Half-Life 2: Episode Two
Half-Life 3
Portal 2
Cooperative Testing Courses
Peer Review

Timeline:
Before 1979(?) (21-30 Years Before Half-Life)
????
Turret Lullaby (pg. 1-5)

1998 (2-11 Years Before Half-Life)
????
Aperture Investment Opportunity #1: "Panels"
Aperture Investment Opportunity #2: "Bot Trust"
Aperture Investment Opportunity #3: "Turrets"
Aperture Investment Opportunity #4: "Boots"

200? (0 Years Before/After Half-Life)
March 3rd
Half-Life: Opposing Force Soldier's Handbook (pg. 2)

March 7th
Boot Camp
Half-Life: Opposing Force Soldier's Handbook (pg. 7)

March 9th
Half-Life: Opposing Force Soldier's Handbook (pg. 9)

March 12th
Half-Life: Opposing Force Soldier's Handbook (pg. 11)

March 15th
Half-Life: Opposing Force Soldier's Handbook (pg. 18)

May
Portal 2: Lab Rat (pg. 3-4)
Portal 2: Lab Rat (pg. 10)
Portal 2: Lab Rat (pg. 13-14)
Portal 2: Lab Rat (pg. 22)

May 12
Hazard Course (Blue Shift)

May 16
Hazard Course (Half-Life)
Half-Life: Decay Mission 1: Dual Access
Half-Life: Blue Shift Chapter 1: Living Quarters Outbound
Half-Life Chapter 1: Black Mesa Inbound
Half-Life: Blue Shift Chapter 2: Insecurity
Half-Life Chapter 2: Anomalous Materials
Half-Life: Decay Mission 2: Hazardous Course
Half-Life Chapter 3: Unforeseen Consequences
Half-Life: Decay Mission 3: Surface Call
Half-Life Chapter 4: Office Complex
Half-Life: Opposing Force Chapter 1: Incoming
Half-Life: Blue Shift Chapter 3: Duty Calls
Half-Life: Decay Mission 4: Resonance
Half-Life Chapter 5: "We've Got Hostiles"
Half-Life: Blue Shift Chapter 4: Captive Freight
Half-Life: Decay Mission 5: Domestic Violence
Half-Life Chapter 6: Blast Pit
Half-Life: Decay Mission 6: Code Green
Half-Life Chapter 7: Power Up
Half-Life: Blue Shift Chapter 5: Focal Point
Half-Life Chapter 8: On a Rail
Half-Life: Decay Mission 7: Crossfire
Half-Life: Decay Mission 8: Intensity
Half-Life: Decay Mission 9: Rift

May 17
Xen Attacks
Half-Life: Blue Shift Chapter 6: Power Struggle
Half-Life: Blue Shift Chapter 7: A Leap of Faith
Half-Life Chapter 9: Apprehension
Half-Life: Blue Shift Chapter 8: Deliverance
Half-Life Chapter 10: Residue Processing
Half-Life Chapter 11: Questionable Ethics
Half-Life: Opposing Force Chapter 2: Welcome To Black Mesa
Half-Life Chapter 12: Surface Tension
Half-Life: Opposing Force Chapter 3: "We Are Pulling Out"
Half-Life Chapter 13: "Forget About Freeman!"
Half-Life: Opposing Force Chapter 4: Missing in Action
Half-Life: Opposing Force Chapter 5: Friendly Fire
Half-Life Chapter 14: Lambda Core
Half-Life: Opposing Force Chapter 6: We Are Not Alone
Half-Life Chapter 15: Xen
Half-Life: Opposing Force Chapter 7: Crush Depth
Half-Life Chapter 16: Gonarch's Lair
Half-Life: Opposing Force Chapter 8: Vicarious Reality
Half-Life Chapter 17: Interloper
Half-Life: Opposing Force Chapter 9: Pit Worm's Nest
Half-Life: Opposing Force Chapter 10: Foxtrot Uniform
Half-Life: Opposing Force Chapter 11: "The Package"
Half-Life Chapter 18: Nihilanth
Half-Life - Endgame
Half-Life: Opposing Force Chapter 12: Worlds Collide

May 18
Half-Life: Opposing Force - Conclusion

????
Portal 2: Lab Rat (pg. 19-21)

2010(?) (10-ish Years After Half-Life)
????
Portal
Portal 2: Lab Rat (pg. 1-9)
Portal 2: Lab Rat (pg. 11-18)
Portal 2: Lab Rat (pg. 22-26)

???? (50 Days Later)
Portal 2: Prologue

2015-2024 (15 Years After Half-Life)
November 29(?)
Half-Life: Alyx Chapter 1: Entanglement
Half-Life: Alyx Chapter 2: The Quarantine Zone
Half-Life: Alyx Chapter 3: Is Or Will Be
Half-Life: Alyx Chapter 4: Superweapon
Half-Life: Alyx Chapter 5: The Northern Star
Half-Life: Alyx Chapter 6: Arms Race
Half-Life: Alyx Chapter 7: Jeff
Half-Life: Alyx Chapter 8: Captivity
Half-Life: Alyx Chapter 9: Revelations
Half-Life: Alyx Chapter 10: Breaking and Entering
Half-Life: Alyx Chapter 11: Point Extraction

202? (20 Years After Half-Life)
Autumn
Half-Life 2 Chapter 1: Point Insertion
Half-Life 2 Chapter 2: "A Red Letter Day"
Half-Life 2 Chapter 3: Route Kanal
Half-Life 2 Chapter 4: Water Hazard
Half-Life 2 Chapter 5: Black Mesa East
Half-Life 2 Chapter 6: "We Don't Go To Ravenholm..."

???? (Next Day)
Half-Life 2 Chapter 7: Highway 17
Half-Life 2 Chapter 8: Sandtraps
Half-Life 2 Chapter 9: Nova Prospekt
Half-Life 2 Chapter 9a: Entanglement

???? ("Over A Week" Later)
Half-Life 2 Chapter 10: Anticitizen One
Half-Life 2 Chapter 11: "Follow Freeman!"
Half-Life 2 Chapter 12: Our Benefactors
Half-Life 2 Chapter 13: Dark Energy

???? (A Few Days Later)
Half-Life 2: Episode One Chapter 1: Undue Alarm
Half-Life 2: Episode One Chapter 2: Direct Intervention
Half-Life 2: Episode One Chapter 3: Lowlife
Half-Life 2: Episode One Chapter 4: Urban Flight
Half-Life 2: Episode One Chapter 5: Exit 17

????
Half-Life 2: Episode Two Chapter 1: To the White Forest
Half-Life 2: Episode Two Chapter 2: This Vortal Coil
Half-Life 2: Episode Two Chapter 3: Freeman Pontifex
Half-Life 2: Episode Two Chapter 4: Riding Shotgun
Half-Life 2: Episode Two Chapter 5: Under the Radar
Half-Life 2: Episode Two Chapter 6: Our Mutual Fiend
Half-Life 2: Episode Two Chapter 7: T-Minus One
Half-Life: Alyx Chapter 11: Point Extraction (Epilogue)

????
Half-Life 3

52,000(?) (50,000 Years After Half-Life)
????
Portal 2 Chapter 1: The Courtesy Call
Portal 2 Chapter 2: The Cold Boot
Portal 2 Chapter 3: The Return
Portal 2 Chapter 4: The Surprise
Portal 2 Chapter 5: The Escape
Portal 2 Chapter 6: The Fall
Portal 2 Chapter 7: The Reunion
Portal 2 Chapter 8: The Itch
Portal 2 Chapter 9: The Part Where He Kills You

???? (Next Day)
Portal 2: The Credits

????
Cooperative Testing Course: Calibration Course
Cooperative Testing Course: Team Building
Cooperative Testing Course: Mass and Velocity
Cooperative Testing Course: Hard-Light Surfaces
Cooperative Testing Course: Excursion Funnels
Cooperative Testing Course: Mobility Gels

???? (One Week Later)
Cooperative Testing Course: Art Therapy

 

[ThePMan]

Also decided to include Half-Life 3 on here too, because, well, you know.

 

[ThePMan]

I appreciate this previous thread which made the initial effort to chronicle the series' timeline here. However, it hasn't been updated in some time now, and is mostly incomplete and based on a few assumptions. I decided to stick with the confirmed dates/time ranges rather than trying to narrow things down further due to the many inconsistencies and the intentional vagueness of the timeline itself.