Information regarding the actual date is vague but a relatively accurate timeline of events is possible.

Before the series Edit

Frantic man


These are all of the events that were referenced/mentioned throughout the series that have happened prior to the landing of the 100 on Earth. All dates are backtracked from the confirmed date of the nuclear apocalypse, stated to have been in 2052. This is used as Ark Year 1 (year zero doesn't exist in common calendars), the first year people lived on the Ark.

Date (CE) Ark Year Event
1959 −93 The Mount Weather Emergency Operations Center is founded.
2001 −51 Association football (FIFA) game is played as seen in flashbacks on the Ark.
2019 −33 Mir-3, predecessor of the Ark, is presumably launched.
2025 −27 Becca is born.
2040s Earth loses contact with Asteroid Mining Penal Colony.
2048 −4 Two dozen mega reactors had been built to withstand any disaster, even a nuclear attack.
2051 Oct. 20 −1 (0) A.L.I.E. chooses her avatar to be Becca and confirms her mandate is to "make life better" by "fixing the root problem" of "too many people."
2052 May 10 1 A.L.I.E. causes the Nuclear Apocalypse.[1]

Chris records a video of himself on the day of the nuclear apocalypse, claiming that "she got the launch codes". He then kills himself during the recording.

2054 Oct. 1 2 The Alpha Station destroys the 13th Station, known as Polaris, leading to the unification of the 12 remaining stations into The Ark.

Becca descends to Earth with A.L.I.E. 2.0

2086 34 Dante Wallace is born.
2093 41 The doors of Mount Weather are opened, 54 people die of radiation, including Dante's sister and mother. Dante goes outside for 5 minutes.

Presumed beginning of the experimentation on Outsiders

2102 50 MIR-3 salvaged and incorporated into The Ark.

Thelonious Jaha is born.

2107 55 Marcus Kane is born.
2109 57 Abigail Griffin is born.
2126 74 Bellamy Blake is born.
2128 76 Lexa kom Trikru is born.
2131 79 Clarke Griffin is born.
2132 80 Octavia Blake is born.
2137 85 Charlotte is born.
2148 Fall 96 Catastrophic Life Support System Failure discovered.

Jake Griffin gets floated as he attempts to go public with the discovery.
Clarke Griffin is sent to juvenile detention for treason.
Octavia Blake is sent to juvenile detention for being a second child.
Aurora Blake gets floated for having a second child.

2149 97 The 100 receive Earth Skills from Pike on The Ark.
The 100 are sent to Earth and land in what was formerly Virginia in the United States of America.

In the series Edit

Season One starts when the 100 were sent to Earth on Saturday, September 13, 2149[2] and is considered "Day 1."

Season Two begins a day after season one and ends on November 3, 2149.[3]

Season Three begins after a time skip[4] on January 27, 2150.

Season Four begins right after season three ends.

Season Five begins after a time jump of six years and seven days later.

Season 1 Edit

Time on Earth Date (2149) Episode(s) Event
Day 1 Sep. 13 Pilot The 100 land on earth 20 miles west of Mount Weather, Virginia, in the Shenandoah Valley.
Clarke leads a group to Mount Weather while Bellamy starts setting up The Camp.
The Woods Clan-Sky People Conflict unofficially begins with the Delinquents inadvertently invading the Woods Clan territory.
Day 2 Sep. 14 Pilot, Earth Skills Jasper Jordan is speared from across a river near Mount Weather.
A rescue party gets Jasper back to camp. Thelonious Jaha abstains from voting on the culling, postponing it for 10 days.
Day 4 Sep. 16 Earth Kills Trina and Pascal are killed by the Acid Fog overnight. Clarke comforts Charlotte after a nightmare.
Day 5 Sep. 17 Earth Kills Clarke tries to save Jasper. Another round of Acid Fog traps everyone overnight.
Day 6 Sep. 18 Earth Kills Clarke mercy-kills Atom after he was trapped in the Acid Fog.
Day 7 Sep. 19 Earth Kills Charlotte kills Wells at night.
Day 11 Sep. 23 Murphy's Law John Murphy is blamed for murdering Wells and they attempt to lynch him.
Day 12 Sep. 24 Murphy's Law, Twilight's Last Gleaming After a night on the run, Charlotte commits suicide. Murphy is banished. Raven Reyes leaves the Ark on a drop ship headed to Earth.
320 Ark residents are culled to conserve oxygen. That night, flares are set off to alert the Ark they're alive on the ground.
Day 13 Sep. 25 His Sister's Keeper, Contents Under Pressure Overnight, Bellamy and a group of delinquents set out in search of a missing Octavia. That morning, John Mbege, Diggs, and Roma die at the hands of Grounders.
The delinquents finally establish contact with the Ark just as a hurricane hits.
Lincoln is captured and tortured.
Day 15 Sep. 27 Day Trip Dax is sent to kill Bellamy but Bellamy kills him instead. Bellamy is pardoned by Jaha.
Octavia frees Lincoln.
Day 19 Oct. 1 Unity Day The 100 and the Ark citizens celebrate Unity Day.

Diana Sydney's Rebellion ends

Day 20 Oct. 2 Unity Day Clarke and Anya attempt a peace meeting at the bridge that ends in failure.
The Exodus ship comes down a day early and crashes.
The Woods Clan-Sky People Conflict officially begins
Day 23 Oct. 5 I Am Become Death The delinquents investigate the wreckage of the Exodus ship.
Murphy returns to The Camp.
Day 24 Oct. 6 I Am Become Death Murphy was carrying hemorrhagic fever with him and infects most of the Camp.
Day 25 Oct. 7 I Am Become Death Raven and Jasper blow the bridge separating the Grounders from the Delinquents to delay the impending grounder attack.
Day 27 Oct. 9 The Calm Clarke and Finn are taken captive by the Grounders in order to save Tris after she was mortally injured in the bridge explosion. Tris dies and Clarke kills Caliban, trying to escape.
Day 28 Oct. 10 We Are Grounders (Part 1) Bellamy is taken hostage by Murphy, but later escapes. Clarke and Finn escape the Grounders with help from Lincoln.
Day 29 Oct. 11 We Are Grounders (Part 2) The battle between the Delinquents and the Woods Clan occurs in the Delinquents Camp.
The Ark disassembles into the original 12 Stations on the way down to Earth.

Season 2 Edit

Time on Earth Date (2149) Episode(s) Event
Day 30 Oct. 12 We Are Grounders (Part 2), The 48 The next day, the surviving 48 of the 100 are taken by the Mountain Men to Mount Weather.

Clarke breaks out of her quarantine room and is reunited with the other 47 Delinquents.

Day 31 Oct. 13 Inclement Weather Octavia Blake meets Nyko.
Lincoln and Nyko are captured by Reapers.
Day 32 Oct. 14 Reapercussions Indra, Octavia and others free Nyko and other Grounders.
Clarke and Anya escape Mount Weather.
Kane gives Abby the Chancellor's pin.
Day 33 Oct. 15 Many Happy Returns, Human Trials Bellamy, Finn, Murphy, Monroe, and Sterling rescue Mel. Sterling dies in the process.
Jaha meets a family of Nomadic Grounders in a desert but is later traded for a horse.
Anya is killed by a Camp Jaha Guard. The guards bring Clarke into Camp Jaha thinking she is a Grounder.
Day 34 Oct. 16 Human Trials Bellamy, Octavia, and Monroe bring Mel back to Camp Jaha.
Kane is imprisoned in Tondc and reunites with Thelonious Jaha. Bellamy, Octavia, and Clarke leave Camp Jaha to go after Finn and Murphy.
Day 35 Oct. 17 Human Trials Finn massacres 18 innocent Grounders in Tondc
Day 37 Oct. 19 Fog of War Two days after the massacre, Finn is pardoned by The Council.
Raven tells Clarke they need to blow Mount Weather's radio tower. Abby decides to join them.
Day 38 Oct. 20 Fog of War A mission to Mount Weather takes place to destroy the radio tower at its summit. Bellamy and Octavia discover Lincoln as a Reaper. Thelonious Jaha is sent to Camp Jaha by the Commander.
Day 39 Oct. 21 Long Into an Abyss Keenan Mykulak dies of prolonged radiation exposure.
Bellamy and Octavia chain Lincoln up in the dropship. Lexa arrives.

Harper is taken by Lorelei Tsing and Cage and has her Bone Marrow extracted by Dr.Tsing.
Clarke enters the Grounder's camp to negotiate a truce only to find out the only way to start a truce is for Finn to die.

Day 40 Oct. 22 Long Into an Abyss,Spacewalker She then returns to Camp Jaha with the news.
Day 41 Oct. 23 Spacewalker Desperate attempts to keep Finn safe take place.
That night, Clarke mercy-kills Finn.
Day 42 Oct. 24 Remember Me A group travel to Tondc for Finn's funeral.
Day 43 Oct. 25 Remember Me Finn's funeral takes place at Tondc, and his body is burnt. Gustus poisons himself to destroy the peace between the Sky People and the Woods Clan.
Monty gets the radio signal out.
Bellamy and Lincoln are sent to Mount Weather.
Day 44 Oct. 26 Survival of the Fittest Bellamy and Lincoln travel to Mt. Weather.
Clarke and Lexa avoid being killed by the Pauna. That night, Clarke gets an entourage and a horse.
Indra makes Octavia her Second. Bellamy is taken into Mount Weather.
Day 45 Oct. 27 Coup de Grâce The Mountain Men attempt to assassinate Clarke and fail. Bellamy contacts Clarke from inside Mount Weather. Cage takes control of Mount Weather from his father. Clarke takes charge of the Sky People from her mother.
Day 47 Oct. 29 Rubicon A meeting of the 12 Grounder Clans takes places in Tondc
That night, a missile is sent directly from Mount Weather to Tondc, killing ~250 Grounders and Sky People.
Day 48 Oct. 30 Resurrection The surviving residents are rescued from the bombing in Tondc. That night, they leave for Mount Weather.

The Delinquents fight against the Mountain Men to save themselves. Some Mount Weather residents help the Delinquents hide from Cage.

Day 49 Oct. 31 Bodyguard of Lies That night, Lexa orders the death of Octavia as they wait for Bellamy to take out the Acid Fog machine.
Day 50 Nov. 1 Bodyguard of Lies, Blood Must Have Blood (Part 1) The Battle of Mount Weather begins
The Acid Fog machine is destroyed. They march on Mount Weather. Philpott Dam is neutralized. That night, Lexa agrees to a truce with the Mountain Men in exchange for her people trapped inside Mount Weather.
Day 51 Nov. 2 Blood Must Have Blood (Part 2) Clarke, Bellamy, and Monty irradiate Level 5 of Mount Weather, killing every resident of said location except Carl Emerson.
The Battle of Mount Weather ends as well as the Mount Weather War.
Day 52 Nov. 3 Blood Must Have Blood (Part 2) The Sky People return from Mount Weather to Camp Jaha. Clarke chooses not to enter Camp Jaha, and instead leaves on her own.
Jaha meets A.L.I.E.

Season 3 Edit

Time on Earth Date (2150) Episode(s) Event
Day 137 Jan. 27 Wanheda (Part 1) Murphy is released from the lighthouse bunker after 86 days and travels with Jaha from the island back to the mainland. Unknown to Murphy, Jaha has A.L.I.E. with them.
Jasper causes the death of 3 Ice Nation warriors.
Clarke is captured by Roan.
Bellamy, Monty, Kane, and Indra get trapped looking for Clarke.
Day 138 Jan. 28 Wanheda (Part 2) Bellamy, Kane, Indra, and Monty encounter the survivors of Farm station, including Pike and Monty's mom, Hannah.
Murphy leaves Jaha, Otan, and A.L.I.E. behind and takes off in a boat with Emori.
Abby and Jackson save Nyko's life by using Mount Weather's medical facilities.
Azgeda marches onto Trikru lands and Clarke is brought before Lexa by Roan.
Day 145 Feb. 4 Ye Who Enter Here A summit is held in Polis to join the Sky People into the Coalition as the thirteenth clan.
The Ice Nation threatens the summit.
The Ice Nation with help from Emerson sets the self-destruct code on Mount Weather and destroys it, killing 49 Sky People.
Day 146 Feb. 5 Watch the Thrones Nia challenges Lexa to a fight to the death.
A memorial is held at Arkadia for those who died at Mount Weather.
Pike, Bellamy, and others attempt to leave Arkadia to kill the Grounder peacekeeping army but are stopped and arrested.
Roan, representing Nia, loses the fight to Lexa. However, Lexa spares his life, kills Nia, and makes Roan king of the Ice Nation.
Day 147 Feb. 6 Watch the Thrones, Hakeldama Kane informs Pike that he was voted Chancellor.
Pike, with nine others, murder the Grounder peacekeeping army.
Clarke and Lexa discover the murdered army.
Jaha returns to Arkadia, with A.L.I.E.
Clarke confronts Bellamy. He arrests her, but Octavia helps her escape.
Lexa declares "Jus no drein jus daun." ("Blood must not have blood.")
Day 156 Feb. 15[5] Bitter Harvest Roan sends Emerson to Polis as a gift to Clarke. Clarke decides not to kill him and Lexa banishes him.
Pike's men survey land near a Grounder village. That night they go to clear the village, but Octavia had warned them so the Grounders manage a surprise attack.
Day 157 Feb. 16 Thirteen Lexa celebrates her Ascension Day. Semet interrupts to demand justice for his village. Lexa orders a blockade on Arkadia.
Clarke goes to Lexa to say goodbye. They end up sleeping together.
Titus accidentally kills Lexa.
Day 158 Feb. 17 Terms and Conditions, Stealing Fire The blockade on Arkadia goes into effect.
Kane attempts a coup against Pike but is arrested by Bellamy and sentenced to death.
Murphy and Clarke are released from Lexa's room.
Day 159 Feb. 18 Stealing Fire Ontari kills the other Nightbloods over night. Lincoln and Sinclair are also sentenced to death. Titus gives Clarke the Flame and kills himself. Clarke leaves Polis. Kane and the rest of the resistance escape, while Lincoln is executed by Pike.
Day 160 Feb. 19 Fallen, Nevermore The resistance arrives in the cave, where Octavia beats up Bellamy. Pike is captured and delivered to the Grounders. A.L.I.E. uses Raven to get Abby to take the chip. Arkadia is taken over by A.L.I.E.. Jasper escapes with Raven and runs into Clarke who arrives in Arkadia. That night, they go to Niylah's trade-post and they manage to un-chip Raven.
Day 162 Feb. 21 Demons The resistance (minus Harper, Miller and Bryan) head back to Arkadia which is now abandoned. Emori arrives in Polis, and is now chipped. Emerson takes Harper, Miller and Bryan and kills Sinclair. Clarke kills Emerson. That night they burn Lincoln and Sinclair's bodies. Bellamy, Clarke, Octavia and Jasper set out to go find Luna.
Day 163 Feb. 22 Join or Die Ontari is now chipped and A.L.I.E. is taking control over Polis. Bellamy, Clarke, Octavia and Jasper find a way to signal Luna, and get sedated. Kane caves and takes the chip.
Day 164 Feb. 23 Red Sky at Morning Clarke and the others discover that they are on the Floukru oil rig and later ask Luna to help them, to which she refuses due to being a strict pacifist.
Some of A.L.I.E.'s followers find their way to the oil rig and begin to torture its citizens, including Luna.
Clarke and co. are once again made unconscious and are sent back to dry land.
Day 165 Feb. 24 Perverse Instantiation (Part 1), Perverse Instantiation (Part 2) Jasper reveals to the group that he is chipped and part of A.L.I.E.'s army.
One of A.L.I.E.'s followers attempts to murder Clarke but is killed by Roan. Roan joins the resistance movement against the AI. They hatch a plan to get into Polis.
Jaha strikes Ontari on the side of the head, making her brain dead.
The battles in Polis and the City of Light take place concurrently.
A.L.I.E. is destroyed, ending the War Against A.L.I.E.
Octavia kills Pike.

Season 4 and 5 Edit

Time on Earth Date (2150) Episode(s) Event
Day 165 Feb. 24 Echoes Sky People and Grounders deal with the repercussions of A.L.I.E. and the City of Light. Azgeda, led by Echo, takeover Polis. Bellamy tries to bargain with Echo, while Abby and Clarke try to save Roan's life. All of the Sky People left in Polis are taken prisoner.
Day 166 Feb. 25 Echoes Echo advises Roan to kill Clarke. Clarke convinces Roan to make Skaikru the 13th Clan in exchange for the Flame. Roan announces that Azgeda will honor Lexa's Coalition.
Day 174 Mar. 5 Heavy Lies the Crown In Arkadia, Clarke, Bellamy, Raven, and Monty brainstorm solution to the radiation problem. Bellamy, Monty, Miller, Bryan, and Harper set out for Farm Station to get a hydro-generator. At Farm Station, they find a group of slaves – to free them, they blow up the hydro-generator. Meanwhile, in Polis, Kane and Octavia are unsuccessful in convincing the Trishanakru ambassador, Rafel, not to challenge Roan. Echo and Abby are also unsuccessful in convincing the injured Roan to delay the ambassador meeting. In the evening, Octavia kills Rafel.
Day 175 Mar. 6 Heavy Lies the Crown The ambassadors meet and Roan announces that Rafel was found dead. Bellamy's group returns to Arkadia with the slaves but lacking the hydro-generator.
Day 182 Mar. 13 The Four Horsemen The sick Floukru members with Acute Radiation Syndrome (ARS) arrive in Arkadia. All of the Floukru died from ARS, leaving Luna the only survivor.
Jaha, Clarke and Bellamy are on the search to find the Second Dawn Bunker, but their attempts failed.
Clarke writes down a list of a hundred people who get to live.
The Sky People discovers that Luna is immune to radiation, due to her Nightblood.
Day 187 Mar. 18 A Lie Guarded Abby's group arrives on Becca's Island.
Nyko is killed by one of the drones.
Abby's group found Becca's Lab in the middle of the island.
The Sky People discover Clarke's list and confronts her, but Jaha manages to settle the tensions.
Roan declares war on both Skaikru and Trikru, leaving Kane and Bellamy as hostages.
Octavia escapes Polis in order to warn her people, she gets stabbed, but she survives.
Day 188 Mar. 19 The Tinder Box Ilian saves Octavia and bring her to Arkadia, where she manages to warn her people about Azgeda.
As the Ice Nation marches to Arkadia, the Sky People surrounds them and Clarke negotiates with Roan. A deal was finally made.
Ilian burns down Alpha Station.
In Becca's Island, Raven discovers that she has intelligence, due to A.L.I.E. and the EMP.
Day 189 Mar. 20 We Will Rise, Gimme Shelter An angry mob of Sky People attempts to kill Ilian for burning down Alpha Station, but Kane threatens to shoot them if they harm him.
Roan, Clarke, and Bellamy are delivering hydrazine, but one of them gets emptied after one barrel was pierced by an arrow, during the Trikru attack.
Octavia attempts to kill Ilian, but could not do it.
Clarke arrives on Becca's Island.
Black Rain hits Arkadia, and 18 Sky People die.
At Becca's mansion, a scavenger attempts to kill Emori, but was captured. After Emori claims that this was the man who did terrible things to her and her brother, Otan, Clarke decides to experiment on the scavenger.
Day 190 Mar. 21 God Complex The scavenger dies in the radiation experiment.
Clarke discovers that Emori lied about the scavenger, and attempts to test the experiment on Emori as punishment but Murphy refuses, forcing Clarke to inject herself with Nightblood instead.
Abby destroys the radiation test chamber.
Jaha discovers that the Second Dawn Bunker is in Polis and finds it successfully.
Day 194 Mar. 25 DNR Jaha makes an announcement about the Second Dawn Bunker. The Sky People decides to leave Arkadia and head to the bunker.
Trikru attempts to assassinate Roan, but fails.
Day 195 Mar. 26 DNR Jasper, Riley, Harper and some of other Sky People decides to stay behind at Arkadia. Monty decides to stay with them, in case they change their minds.
Day 197 Mar. 28 Die All, Die Merrily The Final Conclave begins at Polis.
Roan and Luna are killed in the battle.
Octavia wins the Conclave, but decides that all of the clans share the bunker equally.
Day 198 Mar. 29 The Other Side Jasper, Riley, and some of the other Sky People at Arkadia, commits suicide.
Monty and Harper leaves Arkadia to find the rest of their friends.
Day 199 Mar. 30 The Chosen The Second Culling takes place at the Second Dawn bunker.
Monty and Harper reunites with Bellamy and Clarke's group.
Group led by Bellamy and Clarke make their way to Becca's island.
Day 200 Mar. 31 Praimfaya Praimfaya destroys Polis.
Clarke sacrifices herself to help her friends escape Praimfaya.
Bellamy Blake, Raven Reyes, Monty Green, Harper McIntyre, John Murphy, Emori, and Echo escape in a rocket to the Go-Sci Ring.
Praimfaya renders Earth uninhabitable.
Time on Earth Date (2155) Episode(s) Event
Day 2,026 Mar. 31 Praimfaya Five years have passed since Praimfaya. Radiation levels have dropped to survivable levels, making Earth habitable once again.
Time on Earth Date (2156) Episode(s) Event
Day 2,399 Apr. 7 Praimfaya Clarke and Madi witnesses the Gagarin land on Earth.

Quotes Edit

References Edit

Start a Discussion Discussions about Timeline

  • What happened to Becca once she landed on earth?

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    • I had always thought that Becca created ALIE  while aboard Polaris in space. Where was it indicated in the series that  ALIE was  created...
    • Hobbitkru wrote: I had always thought that Becca created ALIE  while aboard Polaris in space. Where was it indicated in the series that  A...