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)

February

 * 1993- Annabeth Chase is born to Frederick Chase & Athena.

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 attends Manhattan Museum of Greek and Roman artifacts.
 * Percy destroys Alecto.
 * Master Bolt Stolen by Luke Castellan, Son of Hermes.
 * Percy Jackson kills the Minotaur on Half-Blood Hill.
 * Percy Jackson begins training at Camp Half-Blood.
 * Sally Jackson taken by Hades to the Underworld.

June

 * June 5, 1978 - Grover Underwood is born, the nephew of Ferdinand.
 * June 14, 2006 - Percy Jackson meets Lord Ares, God of War.
 * June 19, 2010-Mars gives Frank 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 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 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. Made Praetor of Camp Jupiter.
 * Late June, 2008 - A Capture the Flag game turns into a search for The Bronze Dragon.
 * June 2010 - Percy carries Juno across the Little Tiber and enters Camp Jupiter.
 * June 25, 2010 - Quest to stop Gaea and her Giants begins with the Seven (Jason, Percy, Piper, Leo, Hazel, Frank and Annabeth). Camp Jupiter declares war on Camp Half-Blood, causing another Civil War.

July

 * July 1 - Hera's/Juno's sacred day
 * July 1, 1994 - Jason Grace is born to Jupiter & Ms. Grace.
 * July 1, 2010 - Annabeth Chase completes her mission for Athena Parthenos. At the same time, Percy Jackson, Jason Grace, and Piper McLean rescue Nico di Angelo and kill the giants Ephialtes and Otis, with the help of the god Bacchus. Meanwhile, Leo Valdez, Frank Zhang, and Hazel Levesque destroy the eidolons, and Leo recovers the works of Archimedes. Later, Percy, Jason, Piper, Nico, Leo, Frank, Hazel, and Gleeson Hedge rush to the rescue of Annabeth, just as she defeats the spider Arachne. When Arachne falls into Tartarus, Percy and Annabeth follow her into the deepest pit of the Underworld, sacrificing themselves to close the Doors of Death on that side while the others try to reach the doors on the mortal side. On the last request of Percy, Nico leads the others to the House of Hades.
 * July 4th - Fireworks on the beach at Camp Half-Blood.

August

 * August 14, 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, 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 retrapped under the sky.
 * 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.