Document Control¶

Field	Value
Document ID	lore-knox-event-timeline
Version	1.0.0
Status	approved
Confidence	Medium
Category (track)	Lore
Build	historic
Owner	PZ Knowledge-Base Pipeline
Created	2026-10-07
Updated	2026-10-08
Review due	2027-01-07
Game versions verified	41.78.16, 42.20, 42.21 (fiction dates verified against the sources below, not by in-game replay)

Executive Summary¶

This document goes one level deeper than lore-foundation on a single question: in the game's own fiction, what happened, in what order, and how does that sequence connect to the day a new character wakes up? It gives the in-fiction chronology in compressed phases (the run-up, the blockade, the failure of containment, the global spread), separates the Exclusion Zone's quarantine sequence from the wider world's, and then explains how the fiction maps onto gameplay settings such as the start date, the start time, the "months since the apocalypse" option and the utility shut-off windows. It closes with what Build 42 adds to the story and world.

The chronology is TIS's copyrighted fiction. This document therefore records dates, sequence and mechanisms in original words and does not reproduce broadcast text, headlines or timeline entries. Only one date is stated directly in a primary source we hold: TIS's 30th-anniversary post dates the outbreak to 6 July 1993 [1]. Nearly all other day-by-day detail rests on the pzwiki Knox Event page, which compiles it from in-game broadcasts and is a fact-only source [3]. That page also flags itself as written against the 42.12.0 release rather than 42.20 [3].

Confidence is Medium: the key anchor dates are consistent between TIS and the wiki, but the detailed chronology is wiki-compiled and was not independently replayed in-game for this document.

Key Takeaways¶

TIS dates the Knox Event outbreak to 6 July 1993 (cited) [1]; the wiki treats 4 July as the notional start of the incident and 6 July as the blockade and evacuation day (cited) [3].
Game day 0 is 9 July 1993, three days after the blockade; the wiki numbers every other in-fiction day relative to it (cited) [3].
The default start day of the month in the sandbox is the 9th for every game mode, which is why a standard game begins on the date the story singles out (cited) [7].
Containment inside the Exclusion Zone fails around 14 to 16 July, and the wiki's chronology has the infection reaching every nation by 22 July and almost everyone by 28 July (cited, wiki-compiled) [3].
The start month, start day, start time, "months since the apocalypse" and utility shut-off windows are the sandbox levers that move play along this fictional timeline (cited; documented on a B42-era wiki snapshot, B41 parity not re-checked) [7].
Build 42 added more broadcasts, channels and fliers to the storytelling, plus four new Knox Country towns (B42, cited) [8][9].
The cause of the outbreak is not established in-game; every origin theory belongs in the quarantine section (cited that none is conclusive) [3].

Purpose¶

This document answers the question a lore reader, a roleplay server owner or a video scriptwriter asks first: "What day is it in the story, and what has already happened?" It lets other documents attach a precise in-fiction date to a place, a broadcast or a sandbox setting without re-deriving the chronology.

Scope¶

Covered: the in-fiction sequence from the weeks before the outbreak to the collapse of the world's institutions; the Exclusion Zone and quarantine sequence; the relationship between fiction dates and the start-date and decay-related sandbox options; and what Build 42 adds to the story and the map.

Excluded: the real-world development and build history (see lore-foundation); broadcast-by-broadcast detail and the media apparatus (see lore-in-world-media); town-by-town gameplay descriptions (see players-map-locations); and any reproduction of TIS's text. Unstable-branch behaviour is out of scope.

Definitions¶

Day 0 — the wiki's label for 9 July 1993, the date on which a default game begins [3].
Knox Evacuation / blockade — the military closure of roads and the removal of residents around Knox Country, dated 6 July 1993 in the wiki chronology [3].
Exclusion Zone — the quarantined area around Muldraugh and West Point, later widened [3].
Knox Infection — the in-fiction illness. The wiki distinguishes the bite-driven spread from a later phase in which people sicken without being bitten [3][4].

Build Applicability¶

Build	Applies	Verified against	Notes
B41 (legacy41)	Yes, as background	pzwiki Knox Event rev 1441597 [3]; release facts from TIS [2]	Fiction dates are build-independent; sandbox option behaviour was read from a B42-era snapshot [7]
B42 (stable 42.21)	Yes	pzwiki Build 42 rev 1443663 [8]; stable date from TIS [2]; 42.21 stable post and forum change list [14][15]	Adds broadcasts, fliers and four towns [8][9]; the 42.21 change list read for this revision names no change to broadcasts, the start date or the outbreak chronology, only an in-game credits update [15]

Reference¶

Anchor dates and the two framings of the outbreak date¶

TIS's own 30th-anniversary post places the outbreak on 6 July 1993 [1]. The wiki's chronology agrees that 6 July is the day the military sealed roads and cleared residents, but opens the story earlier: it counts the chain of events from 4 July, which it presents as the date the incident began [3]. The Knox Infection page gives a looser estimate, placing the first outbreak somewhere between 2 and 6 July, roughly a week before a default game begins [4]. These framings differ in what they call "the outbreak" (first sickness versus public blockade) rather than in the underlying sequence [3][4].

Phase 1 — The run-up (late June to 5 July)¶

According to the wiki, residents of Knox Country noticed an unexplained bad odour in the air weeks before anything else happened, and it persisted through the whole outbreak [3]. Local telephone service was interrupted from 1 July, with press attention on the outage on 2 July [3]. On 3 July a military vehicle carrying an undisclosed hazardous cargo crashed just north of March Ridge and the site was sealed [3]. On 4 July a US Army colonel publicly downplayed the danger and declined to name the substance [3]. On 5 July the county sheriff warned residents about a run of animal attacks on people and livestock [3]. The wiki also records that Brandenburg was struck by a tornado on 18 April 1993, which sets a pre-outbreak backdrop for one of the new B42 towns (B42 town) [10].

Phase 2 — The blockade and the Exclusion Zone (6 to 8 July)¶

On 6 July local papers began reporting a "flu-like" illness in Muldraugh, while military medical facilities at March Ridge and Fort Knox were opened to patients [3]. The wiki then records a morning-to-evening sequence for the same day: roads blocked at 06:00 EDT, fences and checkpoints by 11:00, hazmat-clad personnel and rising air traffic in the afternoon, and traffic cleared from the perimeter by evening [3]. The blockaded area covered Muldraugh, West Point, Brandenburg and Fort Knox, with the main military camp south of Louisville [3]. On 7 and 8 July the phone blackout inside the Zone continued, state and federal officials said they had little information, leave was cancelled at nearby bases, and reports of mild sickness among those inside the Zone surfaced; reinforcements arrived on 8 July and a no-fly zone was set [3].

Phase 3 — Day 0 and the first days of play (9 to 13 July)¶

The game begins on 9 July, three days after the blockade [3]. That day's reporting centres on rumours of worsening sickness, a military commander's appeal for calm that conceded confusion but claimed no deaths, and a presidential statement of confidence in the military [3]. From 10 to 12 July the wiki records growing international pressure and domestic unrest, panic buying, border closures in Europe, a World Health Organization recommendation to ground civilian flights, and curfews in major US cities [3]. On 11 July the Exclusion Zone boundary was widened, more residents were displaced, and a quarantine camp inside the Zone was abandoned with its cells unlocked [3]. On 12 July a photograph from West Point reached the press and triggered a fresh wave of panic [3]. On 13 July Louisville's mayor declined to impose a curfew, survivors released from military custody described mass attacks by the infected, and 38 nations issued a joint statement through the United Nations criticising US secrecy [3].

Phase 4 — Containment fails (14 to 16 July)¶

On 14 July a protest inside the Zone ended in shootings, clashes with soldiers followed, and by afternoon the noise of combat had drawn infected to the perimeter fence, producing breaches that widened through the evening [3]. On 15 July intense overnight fighting at the border camp failed to stop the infected, and the military began withdrawing north [3]. The same day brought the first reports of people becoming ill without having been bitten, and by evening the wiki reports the first deaths and reanimations from what it calls an airborne strain, with most camp survivors and Zone soldiers ill and some carriers already in Louisville or across the Ohio bridge [3]. On 16 July the two Louisville papers published final issues warning that the city was overrun and the infection was airborne, Congress relocated to a bunker, and the military demolished the Ohio River bridges [3]. The Louisville article concurs that the city was fully overwhelmed by 16 July [6].

Phase 5 — Global spread (17 to 28 July)¶

From 17 July the wiki lists confirmed illness in additional US and foreign cities, with national broadcasting giving way to emergency programming by 18 July [3]. Governments are recorded moving to shelters or destroying infrastructure between 19 and 23 July, with the infection said to reach every nation by 22 July and a majority of the world's population by 24 July [3]. Broadcasts fall silent from 25 July, and the wiki's last entries state that billions had died by 27 July and almost everyone by 28 July, leaving only small groups of immune survivors [3][4].

Exclusion Zone versus the outside world¶

Inside the Zone the sequence is blockade (6 July), widening and abandoned camp (11 July), fence breach (14 July), withdrawal (15 July) and loss of the border camp (15 to 16 July) [3]. Outside the Zone the same days run through political denial, unrest and curfews, then the loss of Louisville and the bridge demolitions, then the worldwide spread [3]. The wiki Knox Country page summarises the government's response as designating the area an exclusion zone, quarantining it, and blocking information from leaving [5]. Louisville is described as having been quarantined first and later folded into the Zone after being overrun [5].

How the fiction maps onto gameplay¶

The default start day of the month is the 9th for all game modes, matching Day 0 [7]. The sandbox exposes the start month (January to December), the start day, and the start time of day, so a player can place a character earlier or later than the canonical date [7]. A separate "months since the apocalypse" option, off by default, ranges from 0 to 12 months and shifts the starting erosion level and the age of food [7]. Water and electricity shut-off are randomised within a chosen window, with options from instant through several years, and the wiki gives the example that a 2 to 6 month setting guarantees at least two months of service [7]. The sandbox also offers "Apocalypse", "The First Week", "Initial Infection" and "Six Months Later" presets whose names echo the timeline, though what each preset sets is not itemised here [7].

Louisville is not offered as a spawn location because, in the fiction, it is sealed until after the default start date [6]. The wiki notes the mismatch that the city can nevertheless be reached and found overrun on 9 July, even though the story has it fall later [6]. The wiki's own opening note is that the sandbox world has no single fixed day-state: it shows damaged fences and looted or barricaded buildings alongside normal commercial life [3].

B41 vs B42 Delta¶

The fiction itself is identical on both builds; only its delivery and map change.

(B42) The wiki's Build 42 page credits the build with more story-bearing props (flyers, papers, painted vehicles, decor), extra radio and TV output, and characters from those broadcasts who can be found at the sites tied to their jobs or deaths [8].
(B42) Knox Country gained Irvington, Echo Creek, Brandenburg and Ekron, and Irvington can be chosen as a starting location in Custom Sandbox as of Build 42 [8][9][10][11][12].
(B42) Riverside received a large rise in zombie population in Build 42 [13]. This is a gameplay change, not a change to the chronology.
(B42) The wiki Build 42 roadmap mentions a challenge map titled "Many years later", focused on post-apocalyptic crafting and survival [8]. Its in-fiction date is not stated in the sources held, so it is not placed on the timeline here.
(B41) Build 41 predates these additions, so on 41.78.x the timeline above is conveyed with the older broadcast set and without the four new towns [8][9].

For the build-history delta see players-b41-to-b42-transition and lore-foundation.

Practical Guidance¶

Choosing a start date. If a script, roleplay server or video needs the story's "opening day", use 9 July 1993 and the default start-day setting [3][7].
Pacing a story. The Phase 3 to Phase 4 window (9 to 16 July) is the stretch in which the Zone's containment fails, so a character who starts later in the month is arriving in a world that the chronology says has already partly collapsed [3].
Choosing a decay feel. To simulate time having passed, combine a later start date, a non-zero "months since the apocalypse" and a shorter utility window; these are the documented levers [7].
Quoting the date. State which framing you use (4 July for the incident, 6 July for the TIS-stated outbreak and blockade) [1][3].
Location choices. For which town the fiction places where, defer to players-map-locations.

Common Pitfalls & Troubleshooting¶

Treating the wiki chronology as TIS-stated. Only the 6 July date is anchored here to a TIS post [1]. The detailed day entries are the wiki's compilation [3].
Assuming Louisville is playable in the fiction's early days. It is not a spawn point, and yet it is already overrun in play on 9 July, although the story places its fall later [6].
Confusing the sandbox presets with the timeline. The preset names echo story phases, but the wiki snapshot did not pin down what each one sets [7].
Reading the "months since" option as a calendar shift. It is documented as affecting starting erosion and food age, not as moving the in-game date [7].
Mixing stable and unstable-era B42 values. The sandbox page snapshot was fetched on 2026-07-31, after 42.20 stable, but the Knox Event page carries a self-declared 42.12.0 currency note [3][7].

Community Notes & Unverified Claims¶

Claim 1 — The US military caused the outbreak¶

Claim: Fan discussion and the wiki's "rumored causes" digest point to the military as at least partly responsible, citing the March Ridge spill, the speed of the blockade, a research facility near Rosewood, and radio callers who allege bioweapon work.
Why unverified: The wiki itself states that no conclusive evidence for any single theory exists in the current build [3]. The theories are fan inference from in-game callers, not TIS-stated canon.
Confidence: Low. It is suggestive circumstantial reading of fiction, and the wiki explicitly declines to endorse it.

Claim 2 — A 4 July terrorist attack or sabotage began the outbreak¶

Claim: Some fans read the early phone outage and a radio caller's remarks as evidence of deliberate sabotage or terrorism timed to Independence Day.
Why unverified: The wiki lists this only as one rumoured cause among several, and notes in the same passage that the evidence does not establish it [3]. TIS's own post dates the outbreak to 6 July [1].
Confidence: Low. It rests on a single caller and a newspaper speculation, both inside the fiction.

Claim 3 — Odd earlier events (a 1991 sky phenomenon, a 1990 food-borne illness) are connected to the Knox Event¶

Claim: Fans link a strange-lights sighting in 1991 and a 1990 outbreak tied to a fast-food chain to the Knox Infection.
Why unverified: The wiki mentions both as speculation, flags one with a verification tag, and states that the cause remains unknown [3].
Confidence: Low. The connection is conjecture, and the wiki marks at least part of it as unverified.

Claim 4 — The default start date was chosen to put play just before containment collapses¶

Claim: Community commentary reads the 9 July default as a deliberate design choice that gives the player a week or so of "normal" play before the Zone falls.
Why unverified: The sources establish that 9 July is the default start day [3][7] and when the Zone fails [3], but no developer statement on the intent was found.
Confidence: Medium. The arithmetic of the dates supports the reading, but intent is not documented.

Risks & Caveats¶

Wiki dependence. Most day-level entries come from one pzwiki page which flags itself as written against 42.12.0 [3]. Later story additions in 42.13 to 42.21 may be missing; the 42.21 change list [15] was read in the 2026-10-07 re-baseline and is a selected list for multiplayer fixes, so absence there is a weak signal.
Single primary anchor. Only the 6 July outbreak date is tied to a TIS post here [1]. The post was not re-opened for this document and is cited as recorded in lore-foundation.
B41 parity of sandbox options. The Custom Sandbox facts were read from a snapshot fetched on 2026-07-31 [7]. Whether every option exists identically on 41.78.16 was not checked.
Spoilers and copyright. Fiction detail is TIS's work. This document paraphrases only dates and sequence.
No in-game replay. Dates were not confirmed by playing the broadcasts.

Verification Steps¶

Open the TIS post "Knox Event: 30 Years On" [1] and confirm the 6 July 1993 outbreak date.
Fetch the pzwiki Knox Event page at revision 1441597 [3] and compare the day-by-day entries with the phases above.
In a new Custom Sandbox game, inspect the Time section for start month, start day and start time, and the World section for the water and electricity shut-off ranges and the "months since" option [7].
Start a default game and check the in-game date reads 9 July 1993.
Check that Louisville is absent from the spawn-region list [6].
On Build 42, confirm that Irvington, Echo Creek, Brandenburg and Ekron exist and that Irvington is a selectable start [9].

Open Questions¶

Is there an official TIS statement on the 4 July versus 6 July framing, and does the official @TheKnoxEvent retelling use the same day numbering as the wiki?
Do 42.13 to 42.21 broadcasts or fliers add or amend chronology entries that the wiki has not caught up on?
What exact values do the "Apocalypse", "The First Week", "Initial Infection" and "Six Months Later" presets set, and does that differ between B41 and B42?
What is the in-fiction date and premise of the "Many years later" challenge map, if released?
Is the Louisville spawn restriction unchanged on 42.21? The 42.21 change list mentions a spawn-point selection preview-video update to match the map glow-up but no rule change [15].

References¶

Primary Sources

[1] The Indie Stone — Knox Event: 30 Years On (blog, 2023-07-06). https://projectzomboid.com/blog/news/2023/07/knox-event-30-years-on/. Accessed 2026-10-07 (as recorded in lore-foundation).
[2] The Indie Stone — BUILD 42 STABLE PLANS (blog, 2026-07-24). https://projectzomboid.com/blog/news/2026/07/build-42-stable-plans/. Accessed 2026-10-07.
[14] The Indie Stone — Build 42.21 Stable Released (Steam announcement, 2026-09-28). https://steamcommunity.com/games/108600/announcements/detail/1844751498231307 Accessed 2026-10-07; host is bot-block allowlisted.
[15] The Indie Stone Forums — 42.21 Patch Notes (topic 101693, first post by Rockjaw, 2026-09-23). https://theindiestone.com/forums/topic/101693-4221-patch-notes/ Accessed 2026-10-07 via browser page-text extraction; host bot-blocks checkers.

Fact-Only Sources (no prose reuse) — pzwiki (CC BY-NC-SA 3.0): cite URL + revision id; facts only, never prose.

[3] PZwiki — Knox Event (revision 1441597). https://pzwiki.net/wiki/Knox_Event. Accessed 2026-10-07. Fact-only source.
[4] PZwiki — Knox Infection (revision 1438437). https://pzwiki.net/wiki/Knox_Infection. Accessed 2026-10-07. Fact-only source.
[5] PZwiki — Knox Country (revision 1439185). https://pzwiki.net/wiki/Knox_Country. Accessed 2026-10-07. Fact-only source.
[6] PZwiki — Louisville (revision 1440857). https://pzwiki.net/wiki/Louisville. Accessed 2026-10-07. Fact-only source.
[7] PZwiki — Custom Sandbox (revision 1442995). https://pzwiki.net/wiki/Custom_Sandbox. Accessed 2026-10-07. Fact-only source.
[8] PZwiki — Build 42 (revision 1443663). https://pzwiki.net/wiki/Build_42. Accessed 2026-10-07. Fact-only source.
[9] PZwiki — Irvington (revision 1441243). https://pzwiki.net/wiki/Irvington. Accessed 2026-10-07. Fact-only source.
[10] PZwiki — Brandenburg (revision 1442529). https://pzwiki.net/wiki/Brandenburg. Accessed 2026-10-07. Fact-only source.
[11] PZwiki — Echo Creek (revision 1404467). https://pzwiki.net/wiki/Echo_Creek. Accessed 2026-10-07. Fact-only source.
[12] PZwiki — Ekron (revision 1436857). https://pzwiki.net/wiki/Ekron. Accessed 2026-10-07. Fact-only source.
[13] PZwiki — Riverside (revision 1443703). https://pzwiki.net/wiki/Riverside. Accessed 2026-10-07. Fact-only source.

Secondary & Corroborating — none used.

Community & Creator — none used.

Further Reading

Revision History¶

Version	Date	Author	Change	Approved By
0.1.0	2026-10-07	KB Pipeline (virtual agent)	Initial draft.	—
0.2.0	2026-10-07	KB Pipeline (revision worker)	Re-baselined to 42.21: reviewed against the 42.21 stable announcement and the forum change list; no chronology change found, version scope only (Build Applicability, Risks, Open Questions); added sources [14][15].	—
1.0.0	2026-10-08	Orchestrator (KB Pipeline)	Approved and frozen — release kb-release-2026.10.08 (42.21 re-baseline; validated against 42.21 and 41.78.21, Umbrella 42.21.0 @ 13d01f9). Content is the reviewed 0.2.0 text.	Project owner (user instruction 2026-10-08)