Important Dates

This page contains important dates or occurrences during the events of Percy Jackson and the Olympians and The Heroes of Olympus series. If an exact date is unknown, you can add just the year to the month it takes place in. Please do not add an event that does not relate to the Percy Jackson or the Heroes of Olympus series (such as the birthdays of the actors/actresses) as this page is for dates taking place within the series, not in the real world.

January

 * Nico's birthday (while undecided) is stated by Rick Riordan to be January 28th, 1924 (this would mean that his mother's death was around 1934)

April

 * April 2010 - Percy Jackson awakes after months in deep sleep by Hera/Juno, begins training with Lupa at the Wolf House.

May

 * May 2006 - Yancy Academy visits the Manhattan Museum of Greek and Roman artifacts.
 * Percy destroys Alecto.
 * Percy Jackson kills the Minotaur on Half-Blood Hill.
 * Percy Jackson begins training at Camp Half-Blood.
 * Sally Jackson is taken by Hades to the Underworld.

June

 * June 5, 1978 - Grover Underwood is born, the nephew of Ferdinand.
 * June 11, 2006 - Percy Jackson, Annabeth Chase, and Grover begin their quest for the Master Bolt.
 * They face Alecto, Megaera, Tisiphone, and Medusa in New Jersey.
 * June 13, 2006 - Percy confronts Echidna and the Chimera at the St. Louis Arch.
 * June 14, 2006 - Percy Jackson meets Lord Ares, God of War.
 * On the way to Las Vegas, Percy learns the true story of Thalia's sacrifice.
 * Annabeth discusses her home life
 * Annabeth and Percy begin to form a bond.
 * June 15, 2006 - Percy, Annabeth, and Grover arrive at the Lotus Hotel and Casino. They don't leave until June 20, five days later.
 * June 19, 2010 - Percy Jackson carries Juno across the Little Tiber and enters Camp Jupiter. He is accepted into the camp by Octavian, and into the Fifth Cohort by Dakota. Later, Frank Zhang is claimed by the god Mars and is given the quest to free Thanatos.
 * The Fifth Cohort wins their first war game in a long time.
 * June 20, 2006 - Percy Jackson, Annabeth Chase and Grover enter the Underworld and meet Hades.
 * June 20, 2010 - Percy Jackson, Hazel Levesque, and Frank Zhang begin their quest to rescue Thanatos. The karpoi capture Levesque, and the group witnesses the goddess Iris repel the forces of Polybotes. With the help of Gray the spartus, Zhang defeats the basilisks. Levesque reports the army to Praetor Reyna, and Iris leads them to Portland to find Phineas.
 * June 21 - The Summer Solstice, when all the gods gather to have a meeting.
 * June 21, 2006 - Percy Jackson duels Lord Ares for the Master Bolt and for the Helm of Darkness, winning the duel.
 * June 21, 2010 - Percy Jackson, Hazel Levesque, and Frank Zhang travel to Portland, Oregon. They meet Ella the Harpy, and rescue her from Phineas. After they defeat Phineas, Jackson's memory begins to return.
 * June 22, 2010 - Jackson, Levesque, and Zhang meet Queen Hylla of the Amazons, who discreetly helps them escape on Arion. They then fight off Laistrygoinians in front of Grandmother Zhang's house. They then fly to Alaska.
 * June 23, 2010 - Jackson, Levesque, and Zhang arrive in Alaska. Zhang uses his last spartus against Gryphons. Afterwards, Jackson almost drowns in the Earth.
 * June 24 - The Feast of Fortuna, which determines how Camp Jupiter's luck will be the rest of the year.
 * June 24, 2010 - Percy Jackson leads Roman army and defeats giant Polybotes. He is subsequently elected Praetor of Camp Jupiter.
 * June 24, 2006 - The second Titan War starts.
 * Late June, 2008 - A Capture the Flag game turns into a search for the Bronze Dragon.
 * June 25, 2010 - The quest of the seven Heroes of Olympus (Jason Grace, Percy Jackson, Piper McLean, Leo Valdez, Hazel Levesque, Frank Zhang, and Annabeth Chase) begins. Camp Jupiter declares war on Camp Half-Blood, causing another Civil War. Grace, Jackson, Zhang, and Levesque become fugitives from New Rome.
 * Leo Valdez and Hazel Levesque meet Nemesis, who offers her help. They fight Narcissus and his followers for a celestial bronze shield.
 * June 26, 2010 - Percy Jackson, Jason Grace, and Piper McLean meet Bacchus in Topeka, Kansas. The eidolons possess Jackson and Grace, causing them to fight. With the help of Blackjack, McLean breaks them up, but this causes future problems for the two demigods. Using her charmspeak, McLean ensures the eidolons wouldn't linger on the Argo II.
 * June 27, 2010 - Percy Jackson, Frank Zhang, and Gleeson Hedge confront Keto and Phorcys in Atlanta.
 * June 28, 2010 - Annabeth Chase, Piper McLean, and Hazel Levesque meet with Venus in Charleston. Shortly after, they are apprehended by Roman demigods, led by Octavian. Reyna lets Chase go, but warns her that she would have no choice but to order an attack on Camp Half-Blood. The Heroes of Olympus depart from the United States -- on the way to Mediterranean Sea.
 * June 29, 2010 - The Argo II is ambushed by a Skolopendra, and Leo Valdez, Hazel Levesque, and Frank Zhang discover Camp Fish-Blood.
 * June 30, 2010 - The Heroes of Olympus arrive in the Mare Nostrum. Jason Grace and Piper McLean face Hercules and Achelous. Later, Percy Jackson and Annabeth Chase defeat Chrysaor, the son of Medusa and Poseidon.

July

 * July 1 - Hera's/Juno's sacred day
 * July 1, 1994 - Jason Grace is born to Jupiter and Ms. Grace.
 * July 1, 2010 - Final day of the Quest for the Athena Parthenos.
 * Annabeth Chase completes her mission for the Athena Parthenos.
 * Percy Jackson, Jason Grace, and Piper McLean rescue Nico di Angelo
 * Percy and Jason kill the giants Ephialtes and Otis, with the help of the god Bacchus.
 * Leo Valdez, Frank Zhang, and Hazel Levesque recover the works of Archimedes.
 * Percy and Annabeth fall into Tartarus after Arachne drags Annabeth to the edge of the pit and Percy tries to save her.
 * Percy tells Nico to lead the others to the Doors of Death on the Mortal side, located in the House of Hades.
 * July 4th - Fireworks on the beach at Camp Half-Blood.

August

 * August 11, 2009 - Princess Andromeda sinks beneath the waves, along with several hundred monsters and demigods including Charles Beckendorf.
 * Percy Jackson hears the Great Prophecy for the first time.
 * August 15, 2009 - Beckendorf's shroud is burned.
 * Rachel Elizabeth Dare goes on vacation.
 * August 16, 2009 - The Battle of Manhattan begins.
 * Michael Yew goes M.I.A
 * The city of Manhattan falls asleep due to Morpheus' enchantment.
 * Rachel Elizabeth Dare leaves for vacation.
 * August 17, 2009 - The Clazmonian Sow is unleashed. It is later killed by a Hermes statue and two stone lion statues.
 * Hyperion and his army attack at the Central Park reservoir.
 * August 18,1993 - Perseus "Percy" Jackson is born to Sally Jackson and Poseidon.
 * August 18, 2009 - The Second Olympian War ends.
 * Titan Army loses the Second Olympian War.
 * Kronos' scythe, a.k.a. Backbiter, is destroyed by the Olympian Goddess Hestia.
 * Ethan Nakamura betrays the Titans and becomes the last person to be killed by Lord Kronos.
 * Luke Castellan stabs himself to destroy Lord Kronos.
 * Titan Lord Kronos is scattered and will most likely never be able to reform again.
 * Percy and the Greek Demigod forces successfully fend off the Titan Army from Manhattan and save Mount Olympus.
 * Jason and the Roman Demigod forces destroy the Titan base at Mount Othrys, with Jason defeating Krios with his own hands.
 * Hades and his Undead Army successfully defend the Empire State Building from the remaining Titan forces.
 * Poseidon and his Aquatic Army help defeat Typhon.
 * Rachel Elizabeth Dare becomes the new Oracle after the curse is lifted by Hades.
 * Percy Jackson makes the Olympians swear on the River Styx to claim their children by the age of 13, give Hades and the minor gods thrones on Olympus cabins at Camp Half-Blood, and to never make a pact of the Big Three.
 * Percy realizes Luke was the true hero.
 * The Prophecy of Seven is revealed.
 * Percy and Annabeth start dating.

September

 * September 15, 2009 -
 * Aeolus orders all demigods to be killed.
 * Venti are released after the death of Typhon.
 * September 18, 2009 - Percy and Annabeth's one-month anniversary
 * Percy forgets his 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 from mortals.

October

 * October 2009 - Jason Grace, a recently elected praetor, disappears from Camp Jupiter.

November

 * November 2009 - Zeus recalls all the Gods back and closes Olympus, forbidding all contact to demigods and mortals.

December

 * December 15, 2007
 * Thalia, Percy, and Annabeth meet up with Grover who has been tracking two demigods; Nico and Bianca
 * Annabeth is captured by Dr. Thorn.
 * December 13/14, 2009 - Percy Jackson goes missing.
 * December 16, 2009 - Jason Grace, Piper McLean, and Leo Valdez go to Camp Half-Blood and the Prophecy of Seven is set in motion.
 * December 17, 1928 - Hazel Levesque is born to Marie Levesque and Pluto.
 * December 17, 2009 - Jason Grace, Leo Valdez, and Piper McLean begin their quest to save Hera.
 * December 19, 2007 - Bianca di Angelo is killed when she destroys Talos in the Junkyard of the Gods.
 * December 20, 2009 - Aeolus cancels his order for all demigods to be killed.
 * December 21, - Day of the Winter Solstice, when all the gods including Hades gather at Mount Olympus.
 * December 21, 2004 - Master Bolt stolen by Luke Castellan, son of Hermes.
 * December 21, 2007 -
 * Luke Castellan has a fall that would've killed him if he didn't bear the Curse of Achilles from Mount Tamalpais.
 * Percy, Grover, Thalia, and Zoë rescue Artemis, goddess of the hunt and the moon, and Annabeth from Dr. Thorn, a manticore.
 * Zoë Nightshade is killed from both the poison of Ladon and the blow from her father Atlas, while fighting him on Mount Orthys, the Titan base.
 * Atlas is trapped under the sky again.
 * A new constellation is formed by Artemis from the body of Zoë Nightshade, known as "the Huntress".
 * Thalia becomes the new lieutenant of the Hunters of Artemis, declaring Percy Jackson as the child of the Great Prophecy.
 * December 21, 2009 - Jason Grace, Piper McLean, and Leo's due date to rescue Hera from Gaea.
 * Porphyrion is resurrected from Tartarus at the Wolf House.
 * The Second Giant War begins.
 * December 22, 1989 - Thalia Grace is born to Ms. Grace and Zeus.
 * 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.