Version
This article is for the PC version of Stellaris only.
Random events
Colony events can trigger 1, 2, 3, 4, or 5 years after a planet or ring world is colonized. Each colony can only get one colony event, and planets that have been 
Terraformed are blocked from getting any event except for ones guaranteed by a 
Planet Modifier. Most events are limited to once per empire, although some are limited to once per game and some have lighter or no limits.
Generic colony event triggers[]
The following trigger conditions apply to all colony events, unless otherwise noted:
- Planet owner
Planet is owned by the original owner- Planet owner is not AI
- Planet
- Planet hasn't had a colony event
- Planet hasn't been terraformed
- Colony isn't a Habitat
- Planet isn't a species homeworld
- Planet isn't an empire's capital
- Planet doesn't have ground combat and isn't occupied
- Colony has at least one Pop
Guaranteed events[]
Certain planet modifiers or planetary features will trigger a guaranteed colony event, usually when the colony turns one year old.
| Event | Planet modifier | Notes |
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| What Happened Here? |   Irradiated |
 Planets can't get this modifier[1], so this event can never trigger. (Unless the game is modded.)
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| Titanic Life |   Titanic Life |
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| Earthquake! |  Unstable Tectonics |
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| Comet Sighted Through Belt |  Asteroid Belt |
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| Crackdown |  Atmospheric Hallucinogen |
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| Magnetic Miracle |  Strong Magnetic Field |
Both events have a 50% chance to trigger. |
| Magnetic Disruption |
| Event | Planetary feature | Notes |
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| An Unexpected Friend |  Enigmatic Robot
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Random events[]
If a colony doesn't get a guaranteed event when it's one year old, it's eligible to start rolling for a random colony event when it reaches two years old. 
Continental Worlds are the only class of planet with access to every single existing colony event that isn't 
Tomb World exclusive, and 
Desert Worlds are the only class of planet that only has access to colony events that are also available to every other regular planet class.
Because terraforming prevents colony events, you can't use it to try to get events that are restricted to certain planet classes. Additionally, if you want to have a chance to get any colony event, and aren't also looking for one of the terraforming events that can only trigger on uninhabited planets, you should always colonize planets that don't have a planet modifier that gives a guaranteed event before terraforming them and then wait to terraform them until they either get a colony event or reach five years old.
It may be worth considering which restricted colony events your guaranteed habitable worlds will have access to when selected your species' climate preference.
Habitats can't get colony events.
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 Universal colony events (available to all planet classes)
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| Asteroid Sighted | 
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 Less than 50 years have passed
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| Ancient Drones |
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| A Change of Heart |
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| Odd Factory | 
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| What Separates Us |
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| Lost to Bureaucracy |
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 Has a building
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| The Mysterious Moon of Root.GetName |
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Has an uninhabitable moon | |
| The Doorway |
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| Impossible Corrie |
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 A pop has the Miner or Mining Drone job
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| Regular colony events (available to all regular planet classes)
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| Subterranean Civilization |
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| Abandoned Terraforming Equipment |
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| Mushroom Picking |
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| Insidious Ophidians |
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| Dancing Plague |
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 A main species pop
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 Restricted colony events (not available to all regular planet classes)
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| Migrating Forests |
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| Mharin Kharin |
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| Trouble in Paradise |
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    Militarist or Pacifist ethics
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| From Beneath the Waves |
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 Destroyers technology
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| Feral Overload |
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| Unsteady Ground |
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| Tomb World colony events
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| Underground Vault |
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Planet wasn't made into a Tomb World by primitives nuking themselves
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| Nuclear Bomb |
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| Ruined Particle Accelerator |
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| Surviving Infrastructure |
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| Derelict Space Station |
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Planet wasn't made into a Tomb World by primitives nuking themselves
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| Wasteland Radiation |
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| Pacifist Movement |
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Colony has a free pop that isn't mechanical or pacifist
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| Orbital Debris |
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Planet wasn't made into a Tomb World by primitives nuking themselves
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 Archaeology Site colony events
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| Fossils Discovered on Root.GetName |
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| Message in the Canopy |
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No Archaeology Site
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 Situation colony events
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| Mysterious Labyrinth |
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Can be rolled but can't trigger
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| Living Snow |
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Can be rolled but can't trigger
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Event chances[]
When the colony is 1 year old, certain planet modifiers will trigger a guaranteed event. At 2 and 3 years old, there are a large variety of possible random events, while there is a much shorter list of possible events when the colony is 4 or 5 years old. The odds of any specific event triggering is equal to that event's weight divided by the total weight of no event plus all potential events for that colony age.
| Event | 2 Years | 3 Years | 4 Years | 5 Years | Limit | |||
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| No event | 150 | 150 | 150 | 150 | – | |||
| Migrating Forests | 3 | 2 | – | – | Once per game | |||
| Subterranean Civilization | 3 | 2 | – | – | Once per game | |||
| Ancient Drones | 3 | 2 | – | – | Once per empire | |||
| Mharin Kharin | 3 | 2 | – | – | Once per game | |||
| Feral Overload | – | 10 | – | – | Once per empire | |||
| Abandoned Terraforming Equipment | 15 | 10 | – | – | Once per empire | |||
| Asteroid Sighted | 6 | 6 | – | – | Once per empire | |||
| Trouble in Paradise | 3 | 10 | 1 | Special[2] | ||||
| From Beneath the Waves | 15 | 10 | – | – | Once per empire | |||
| A Change of Heart | – | 10 | 1 | 3 | Special[2] | |||
| Odd Factory | 15 | 10 | – | – | Once per empire | |||
| What Separates Us | 15 | 10 | – | – | No limit | |||
| Lost to Bureaucracy | – | 10 | – | – | No limit | |||
| The Mysterious Moon of Root.GetName | 10 | 10 | – | – | Once per empire | |||
| The Doorway | 8 | 5 | – | – | Once per empire | |||
| Unsteady Ground | 8 | – | – | – | Once per game | |||
| Mushroom Picking | 15 | – | – | – | Once per game | |||
| Insidious Ophidians | 15 | – | – | – | Once per game | |||
| Unexpected Mineral Seams | 8 | 3 | – | – | Once per empire | Once per game | ||
| Tomb World colony events
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2 Years | 3 Years | 4 Years | 5 Years | Limit | |||
| Any tomb world colony event | 525-600 | 350-400 | – | – | ||||
| Underground Vault | 75 | 50 | – | – | Once per game | |||
| Nuclear Bomb | 75 | 50 | – | – | Once per empire | |||
| Ruined Particle Accelerator | 75 | 50 | – | – | Once per empire | |||
| Surviving Infrastructure | 75 | 50 | – | – | Once per empire | |||
| Derelict Space Station | 75 | 50 | – | – | Once per empire | |||
| Wasteland Radiation | 75 | 50 | – | – | Once per empire | |||
| Pacifist Movement | 75 | 50 | – | – | Once per empire | |||
| Orbital Debris | 75 | 50 | – | – | Once per empire | |||
| 2 Years | 3 Years | 4 Years | 5 Years | Limit | ||||
| Impossible Corrie | 3 | 4 | – | – | Once per empire | |||
| Dancing Plague | – | – | 3 | 3 | Once per empire | |||
| Archaeology Site colony events
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2 Years | 3 Years | 4 Years | 5 Years | Limit | |||
 Fossils Discovered on Root.GetName
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3 | 3 | 3 | 3 | Once per game | |||
| Message in the Canopy | 3 | – | – | – | Once per game | |||
| Situation colony events
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2 Years | 3 Years | 4 Years | 5 Years | Limit | |||
| Mysterious Labyrinth | – | – | 3 | 3 | Once per game | |||
| Living Snow | – | – | 6 | 6 | Once per game |
Ethics divergence events[]
These colony events involve changing the ethics of some pops to the opposing ethic. They have no limit on how many times they can happen, but they share a limit on how often an event in this category can happen. An empire can't get any ethics divergence colony event more then once every five years.
Trouble in Paradise
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Please help with verifying or updating this infobox. It was last verified for version 3.3. |
Local political drama on [Root.GetName] has resulted in increased support among a small group of rebels, opposed to our underlying ethics. Their increased support have enabled them to gain more power in the region and vote for their own causes with limited success.
Trigger conditions:
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Is triggered only by:
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Option conditions
 We stand divided.
We stand divided.
Suppress the opposition!
Suppress the opposition!
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A Change of Heart
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Please help with verifying or updating this infobox. It was last verified for version 3.3. |
The below description is one of several available for this event.
As we have grown our roots on [Root.GetName] certain individuals have begun to stray from our beaten path. That is to be expected, but these have supporters. The group feels our spiritualistic view of the universe is not leading us forward fast enough - assured that a more materialistic view of the cosmos is the answer.
Trigger conditions:
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Is triggered only by:
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Option conditions
They are no threat to our pursuits.
Leave them be to find their own way.
Have spiritual guides re-direct them.
Spread propaganda to oppose them.
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A Change of Heart (colony.2011)
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Please help with verifying or updating this infobox. It was last verified for version 3.3. |
The below description is one of several available for this event.
Our attempts at re-directing the parts of the population prone to oppose our core ideals have finally paid off.
Thanks to the tireless efforts of our spiritual leaders we have finally turned the tide, and are bringing more and more faithless into the fold. Not only materialists, but people of all persuasions have seen the light and are casting away their former beliefs. Pray they will never stray from the righteous path again.
Trigger conditions:
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Is triggered only by:
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Immediate effects:
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Option conditions
Blessed be the divine!
Oops...
Oops...
Excellent.
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A Change of Heart (colony.2012)
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Please help with verifying or updating this infobox. It was last verified for version 3.3. |
Our attempts to change the minds of our people on [Root.GetName] have backfired horribly. By banding together over our subjugation attempts they have gained even more followers, making them stronger than ever.
Trigger conditions:
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Is triggered only by:
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Immediate effects:
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Option conditions
The divine be damned!
Curses!
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Repeatable events[]
These colony events have no limit on how many times or how often they can trigger.
What Separates Us
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Please help with verifying or updating this infobox. It was last verified for version 3.3. |
The below description is one of several available for this event.
Having other species living with our people has caused some friction on [Root.GetName]. Be it cultural differences, xenophobia or a common misunderstanding is hard to tell, but what is sure is that these small encounters could turn to the worse if we do not intervene.
Trigger conditions:
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Is triggered only by:
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Option conditions
Distract the angry mob.
  Isolate the xenos from the mob.
  Protect the minority at any cost.
Do not get involved.
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Lost to Bureaucracy
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Please help with verifying or updating this infobox. It was last verified for version 3.3. |
Due to a major clerical error parts of [colony name] has fallen behind in infrastructure maintenance and accommodation services. The people live in rather bleak conditions and will not tolerate it for long. Remedying these problems will cost us time and effort.
Trigger conditions:
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Is triggered only by:
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Option conditions
Unfortunate.
We must invest in this area.
  We have a strong community, help them recover.
Throw out the inhabitants and raze the area.
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Archaeology site events[]
These colony events create archaeology sites.
Fossils Discovered on [Root.GetName]
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Please help with verifying or updating this infobox. It was last verified for version 3.3. |
Fossilized remains from several different species that do not appear to have been indigenous to §H[Root.GetName]§! have been found in a large and secluded valley on the [Root.GetPlanetMoon]. They all date from roughly the same time period, within the span of a few centuries some 3.6 million years ago.
Each of these species seems to have evolved in its own unique biosphere, and all appear to have been sapient. Strangely, every fossilized individual found so far shows signs of having met a violent end.
Trigger conditions:
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Is triggered only by:
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 Curious.
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Message in the Canopy
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Please help with verifying or updating this infobox. It was last verified for version 3.3. |
Our scientists have discovered something unusual on [From.Planet.GetName]. A tropical world, much of the planet's surface is covered with dense jungle: massive, thousand year old trees erupt from the canopy, their leafy crowns towering over the landscape.
At first glance, the distribution of these giants appears random. However, further analysis indicates that the trees are arranged with mathematical precision, and it seems likely they were planted by some long-vanished civilization. What's more, the team leader believes the distribution pattern may comprise a set of coordinates, one that points to an unexplored location deep within the jungle.
Trigger conditions:
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Is triggered only by:
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Curious.
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Tomb world events[]
These colony events can only occur on tomb worlds. They have their own page here.
Planet modifier events[]
Planet Modifier colony events are guaranteed to trigger when the colony is reaches 1 year old, as long as the planet has the triggering planet modifier. Unlike other colony events, they aren't prevented if the planet has been terraformed. They have their own page here.
References[]
- ↑ The
Irradiated planet modifier has a 0% spawn chance and isn't added by any anomalies.
- ↑ 2.0 2.1 One ethics divergence event per 5 years per empire
- ↑ 3.0 3.1 3.2 3.3 3.4 Including robotic pops, even if they aren't sapient.
- ↑ It's unclear to me whether or not the capital building counts; if it does, this trigger will always be true.
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