Comprehensive Silo Timeline¶

Overview¶

The Silo series by Hugh Howey is a post-apocalyptic science fiction saga set in a massive underground bunker where thousands of people live in a society that has forgotten the world above. Originally self-published as a series of novellas, it became a bestselling phenomenon and was adapted into a critically acclaimed Apple TV+ series. This timeline covers all books, audiobooks, and the television adaptation in both release order and in-universe chronological order.

Part 1: Release Order Timeline¶

A comprehensive list of all Silo productions organized by their real-world release dates. Use this section to understand the franchise's evolution from self-published novellas to major streaming series. Unlike Part 2's chronological order, this reflects how audiences originally experienced the Silo universe.

Books¶

Original Wool Novellas (2011–2012)¶

Omnibus Editions & Sequels¶

Graphic Novel¶

Audiobooks¶

Television Series¶

Apple TV+ Adaptation¶

Note: The series was renewed for Seasons 3 and 4, expected to complete the adaptation of all three books.

Part 2: Complete Chronological Order¶

The definitive reading and watch order arranged by in-universe timeline. Every book, novella, and episode is organized to experience the Silo universe as events actually occurred. The series spans approximately 300 years, from the construction of the silos to the events of the main story.

Streaming Legend¶

Era 1: The Before Times & Convention (c. 2049–2052)¶

The construction of the silos and the catastrophic events that ended the old world.

Era 2: The Early Years (2052–2110)¶

The immediate aftermath of going underground and the establishment of order.

Era 3: The Middle Period (2140–2250)¶

Generations pass. The truth becomes myth.

Era 4: The Main Story (c. 2345–2347)¶

The events of Wool and the series—approximately 300 years after the silos were sealed.

Wool / Season 1¶

Between Silos / Season 2¶

Dust / Future Seasons¶

Part 3: Era Timeline Charts¶

Visual representations of the Silo universe's timeline, spanning from the construction of the silos through the main story events. These charts show the relationship between the three books and the approximately 300 years of in-universe history.

Complete Timeline Overview¶

THE SILO TIMELINE
═══════════════════════════════════════════════════════════════════════════════

PRE-CONVENTION ERA                    THE CONVENTION        EARLY YEARS
      (Before 2049)                      (2049-2052)         (2052-2110)
           │                                 │                    │
           ▼                                 ▼                    ▼
┌─────────────────┐                 ┌─────────────────┐  ┌─────────────────┐
│   Normal World  │────────────────►│   Silos Built   │──►│  First Shift   │
│   Senator       │                 │   50 Bunkers    │  │  Donald's Era   │
│   Thurman       │                 │   Nano-weapons  │  │  Silo 1 Control │
└─────────────────┘                 └─────────────────┘  └─────────────────┘
                                            │
                                            ▼
                                    ┌─────────────────┐
                                    │  WORLD ENDS     │
                                    │  2052           │
                                    └─────────────────┘

═══════════════════════════════════════════════════════════════════════════════

MIDDLE PERIOD                        SILO 17 COLLAPSE           SOLO ERA  
    (2110-2140)                         (c. 2140)              (2140-2345)
         │                                  │                       │
         ▼                                  ▼                       ▼
┌─────────────────┐                 ┌─────────────────┐  ┌─────────────────┐
│  Second Shift   │                 │  Jimmy's Youth  │──►│  Solo Survives │
│  Order Enforced │                 │  Rebellion      │  │  35+ years     │
│  Routine Ops    │                 │  Parents Lost   │  │  Alone         │
└─────────────────┘                 └─────────────────┘  └─────────────────┘

═══════════════════════════════════════════════════════════════════════════════

THE MAIN STORY (~2345-2347)
         │
         ▼
┌─────────────────────────────────────────────────────────────────────────────┐
│                              WOOL                                            │
│  ┌──────────┐  ┌──────────┐  ┌──────────┐  ┌──────────┐  ┌──────────┐      │
│  │ Holston  │──►│ Juliette │──►│ Sheriff  │──►│ Uprising │──►│ Cleaning │     │
│  │ Cleans   │  │ Promoted │  │ Uncovers │  │  Begins  │  │ Survives │      │
│  └──────────┘  └──────────┘  └──────────┘  └──────────┘  └──────────┘      │
└─────────────────────────────────────────────────────────────────────────────┘
                                      │
                                      ▼
┌─────────────────────────────────────────────────────────────────────────────┐
│                              DUST                                            │
│  ┌──────────┐  ┌──────────┐  ┌──────────┐  ┌──────────┐  ┌──────────┐      │
│  │ Silo 17  │──►│ Return   │──►│ Silo 1   │──►│  Truth   │──►│   The    │     │
│  │  Solo    │  │   Home   │  │Revealed  │  │  Known   │  │  Ending  │      │
│  └──────────┘  └──────────┘  └──────────┘  └──────────┘  └──────────┘      │
└─────────────────────────────────────────────────────────────────────────────┘

═══════════════════════════════════════════════════════════════════════════════

Book Coverage by Era¶

ERA COVERAGE BY BOOK
════════════════════════════════════════════════════════════════════

FIRST SHIFT: LEGACY
├── Pre-Convention (2049)
├── The Convention (2049-2052)
└── First Decades (2052-2110)
    ▲
    │ PREQUEL - Read first for chronological, last for mystery
    │
SECOND SHIFT: ORDER
├── Middle Period (2110-2140)
└── Maintenance of the Lie
    │
    │
THIRD SHIFT: PACT
├── Silo 17 Collapse (c. 2140)
├── Jimmy's Childhood Lost
└── Solo's Long Isolation (2140-2345)
    │
    │ BRIDGES THE GAP
    ▼
WOOL (Main Story ~2345)
├── Holston's Cleaning
├── Juliette's Rise
├── The Uprising
└── Survival & Discovery
    │
    │
DUST (Conclusion ~2345-2347)
├── Silo 17 & Silo 18
├── Silo 1 Reckoning
├── The Truth Revealed
└── The Future Begins

Part 4: Factions & Locations¶

The Silo universe is defined by its rigid social structure and the mysteries hidden within the depths of each bunker. Understanding these factions and locations is essential to appreciating the story's themes of control, rebellion, and truth.

The Departments¶

IT (Information Technology)¶

The true rulers of each silo. IT controls the servers, maintains the viewing screens, and enforces the Pact. They alone know the truth about the outside world and communicate with Silo 1. The head of IT often holds more power than the Mayor.

• Notable IT Heads: Bernard Holland (Silo 18)
• Key Responsibilities: Server maintenance, cafeteria screens, outside cameras, memory control
• The Secret: IT knows the view of the toxic outside is fabricated when needed

Mechanical¶

The engineers and mechanics who keep the silo running. Located in the lower levels (the "Down Deep"), Mechanical maintains power generation, life support, and all machinery. They are proud, independent, and often at odds with the upper levels.

• Notable Members: Juliette Nichols, Walker, Scottie, Knox
• Culture: Grease-stained, practical, suspicious of IT and the upper levels
• Generator: The massive diesel generator is the heart of each silo

Supply¶

The quartermasters and logistics personnel. Supply manages inventory, resource allocation, and trade between levels. They occupy the middle third of the silo and serve as neutral territory.

• Role: Distribution of food, materials, and equipment
• Position: Literally and politically in the middle

The Mayor's Office¶

Officially the leader of the silo, though real power often rests with IT. The Mayor handles disputes, ceremonies, and public events. They work from the upper levels near the cafeteria.

The Sheriff's Department¶

Law enforcement within the silo. The Sheriff investigates crimes, maintains order, and—most importantly—escorts the condemned to their cleaning. Deputies patrol all levels.

• Notable Sheriffs: Holston Becker, Juliette Nichols
• The Cleaning: The Sheriff ensures those sentenced go outside with their wool pad

The Silos¶

Silo 1 (Control)¶

The master silo, responsible for monitoring and managing all 50 bunkers. Silo 1 operates on a "shift" system where key personnel are cryogenically frozen and awakened in rotation. They control the nano-weapons that can destroy any silo that threatens to reveal the truth.

• Location: Separate from the main silo cluster
• Personnel: Politicians, military, those "in the know"
• The Heads: Leadership awakened every few decades

Silos 2–50 (The Population Silos)¶

Standard silos housing approximately 10,000 people each in a 144-level underground structure. Each silo is self-contained with:

• Upper Levels (1–48): Administration, IT, cafeteria, nursery, schools
• Middle Levels (49–96): Supply, farms, residential, medical
• Lower Levels (97–144): Mechanical, mining, water reclamation, generator room

Silo 17 (The Failed Silo)¶

A silo where the uprising succeeded—and then failed. After the IT head was killed, the silo descended into chaos. Most died within years. Only the man called "Solo" (Jimmy) survived for decades, hiding in the server room.

• Status: Collapsed society, flooded lower levels
• Survivors: Jimmy/Solo, later the children he protected
• Importance: Proves silos can fall—and that people can survive

Silo 18 (Juliette's Silo)¶

The primary setting of Wool and the TV series. A "healthy" silo with functioning society, though tensions between IT and Mechanical simmer beneath the surface.

The Pact¶

A secret agreement among those who know the truth:

1. The silos must remain sealed for ~500 years until the outside is habitable
2. Any silo that threatens to reveal the truth must be eliminated
3. Population control and memory suppression are necessary evils
4. Hope must be maintained through the lie of a toxic outside

Part 5: Legacy¶

The Silo series explores themes that resonate deeply: the nature of truth, the cost of survival, and what it means to hope when hope itself might be a lie.

The Cleaning¶

The most haunting ritual in the Silo universe. When someone expresses a desire to go outside—to "clean"—they are granted their wish. Given wool pads and a suit, they walk out the airlock to "clean" the sensors that show the toxic wasteland. Every cleaner dies within minutes... except one didn't.

The Truth About Cleaning: - Cleaners are given a helmet display showing the world as green and beautiful - The wool is specially treated to deteriorate in the outside air - Cleaners always clean because they believe they're seeing the true world - It's psychological manipulation to maintain the lie even in death

The Nichols Legacy¶

Juliette Nichols represents the rare individual who questions everything:

• Background: Born in the Down Deep, raised in Mechanical
• Skills: Brilliant engineer, relentless investigator
• Journey: Mechanic → Sheriff → Cleaner → Survivor → Revolutionary
• Significance: The first to survive cleaning, the one who uncovers everything

The Thurman Conspiracy¶

Senator Thurman, architect of the silos, made an impossible choice: - Developed nano-weapons capable of consuming all organic life - Built 50 silos to preserve a remnant of humanity - Orchestrated the Convention attacks that killed billions - Created the Pact to ensure 500 years of controlled survival - Justified genocide as the only path to human survival

Key Themes¶

Critical Reception & Cultural Impact¶

The Silo series transformed from a $0.99 self-published short story into a publishing phenomenon:

• Wool became a #1 Kindle bestseller
• Rights sold to 20th Century Fox, later developed by Apple
• Tim Gerard Reynolds' audiobook narration is considered definitive
• The Apple TV+ adaptation has received critical acclaim
• Themes of information control resonate in the digital age

Last updated: February 2026

Timeline compiled for educational and reference purposes. All rights belong to Hugh Howey and respective publishers.