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This page contains important dates or occurrences during the events of Percy Jackson and the Olympians and The Heroes of Olympus series. Rick Riordan has stated that there is no specific year or timeline that the series takes place as book time is not tied to real time. [1]


    • Nico di Angelo's birthday year could be around 1932 because he states in The House of Hades that he had visited Diocletian's Private Residence with his mother and sister when he was about six around the year 1938.



March 2011 - Events of The Hammer of Thor occur.




  • June 14, 2006-The quest for the Master Bolt continues.
  • June 20, 2006 - Percy, Annabeth, and Grover enter the Underworld and meet Hades.
  • June 21 - The summer solstice, when all the gods gather to have a meeting.
  • June 22, 2010 - Percy, Hazel, and Frank meet Queen Hylla of the Amazons.
    • Hylla helps them escape on Arion discreetly.
    • Otrera challenges Hylla for control of the Amazons. Hylla kills her.
  • June 23, 2010 - Frank, Hazel, and Percy arrive at Grandma Zhang's house in Canada.
    • They fight off Laistrygonian Giants surrounding the house.
    • They escape the house and fly to Alaska.
    • Percy, Hazel, and Frank arrive in Alaska.
    • Frank uses his last spartus against a group of Gryphons.
    • Percy develops a fear of drowning after falling into Muskeg.
  • Late June, 2008 - A Capture the Flag game turns into a search for the Bronze Dragon.



  • August 1, 2010 - Feast of Spes, Roman goddess of hope
    • During the second Gigantomachy, this is the intended day of Gaea's awakening.
    • Gaea awakens due to the blood of Annabeth Chase and Percy Jackson.


  • September 2007 - Percy helps Clarisse beat Phobos and Deimos to retrieve the stolen chariot.
  • September 15, 2009 - Venti continue to cause havoc after being released when Typhon was defeated.
    • Aeolus orders all demigods to be killed as a result.
  • September 18, 2009 - Percy and Annabeth's one-month anniversary.
    • The fire-breathing giant Cacus steals Hermes' caduceus.
    • Hermes seeks Percy's help to get his caduceus back.
    • In a battle against Cacus, Percy and Annabeth learn that Cacus plans to cut off communication among the Olympians, as part of Gaea's plan to overthrow the gods.
    • After destroying Cacus, Percy and Annabeth are sent to Paris for their date, as part of Percy's deal with Hermes.
    • Around this time, Zeus has been threatening to close off Mount Olympus to mortals.



  • November 2009 - Zeus recalls all the Gods back and closes Olympus, forbidding all contact to demigods and mortals.
  • November 11, year unknown - Artemis and Apollo are born to Zeus and Leto.


  • December 24, 2009 - Christmas Eve
    • Leo, Jason, and Piper must find Leo's table Buford to prevent Bunker 9 from exploding.
    • While trying to locate Buford, they end up confronting Dionysus' crazed followers - the Maenads.
    • Jason, Leo, and Piper were able to find Buford and prevented Bunker 9 from exploding.


  • The Battle of the Labyrinth is the only book in either series that are impossible to tell exactly when they take place, as no identifying dates are mentioned. However, the book takes place during the summer.