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Ian Thomas is born to Mr. and Mrs. Thomas.
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Ezra Fitz is born to Mr. and Mrs. Fitz.
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Jason Dilaurentis is born to Kenneth and Jessica Day-Dilaurentis.
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Melissa Hastings is born to Peter and Veronica Hastings.
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Wren Kim is born to Mr. and Mrs. Kim.
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Eric Kahn is born to William and Eleanor Kahn.
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Toby Cavanaugh is born to Daniel and Marion Cavanaugh.
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Jenna Marshall is born to Mr. and Mrs. Marshall.
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Emily Fields is born to Wayne and Pamela Fields.
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Hanna Marin is born to Tom and Ashley Marin.
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Maya St. Germain is born to Mr. and Mrs. St. Germain.
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Spencer Hastings is born to Peter and Veronica Hastings through surrogacy.
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Alison and Courtney Day-Dilaurentis are born to Kenneth and Jessica Day-Dilaurentis.
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Aria Montgomery is born to Byron and Ella Montgomery.
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Grace and Noel Kahn are born to William and Eleanor Kahn.
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Mona Vanderwaal is born to Mr. and Mrs. Vanderwaal.
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The DiLaurentis family moves from Stamford, Connecticut after Courtney’s Hospitalization and changes their last name from Day-Dilaurentis to DiLaurentis in order to start over and hide Courtney from their new friends and neighbors.
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Courtney is hospitalized at the Radley due to getting diagnosed paranoid schizophrenia after her twin sister Alison’s constant manipulation and lies caused her to act out and seem violent and unstable. In the end it was Alison’s choice whether or not to send Courtney away, and since it was her plan all along to get rid of her, Courtney is sent away sometime between January and June in 2001 before her 10th birthday.
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Emily, Spencer, Grace, Hanna, Aria, and Alison all find out about Rosewood Day’s infamous Time Capsule game starting the next day. When Ian suggests to Alison that someone might steal her piece of the Time Capsule flag once she’s found it, the same plan begins forming in all the Liars' minds. They are going to steal the piece from Alison.
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As Emily, Spencer,Grace, Hanna, and Aria assemble in Alison’s backyard getting ready to steal her piece of the flag, inside, Courtney realizes she has the perfect opportunity to take her sister's spot and trick their parents. Seizing the opportunity, Courtney struts outside wearing her sister's ring, shoes and matching clothes. She begins a conversation with the Liars, and when it’s time for Courtney to leave for the Preserve, Mrs. DiLaurentis mistakes her for her sister.
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The Saturday after the twin swap, Courtney goes to the Rosewood Day Charity Drive where she befriends Spencer, Hanna, Grace, Aria and Emily.
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Courtney's plan backfires and Jenna is blinded.
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Toby leaves Rosewood and goes to a juvenile facility. The girls go camping in the Poconos and Alison (Courtney) gives them their friendship bracelets for The Jenna Thing.
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Hanna and Alison (Courtney) go to Annapolis to see Hanna's dad.
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Ian kisses Spencer after Courtney promises to kiss him if he kisses Spencer.
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Aria records a casual home video of a talk show featuring Courtney, Spencer, Hanna, Grace, Emily and Ian. This footage later emerges during Ian’s trial.
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Aria and Courtney catch Byron cheating.
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Emily kisses Courtney.
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Spencer, Emily, Grace, Hanna, and Aria visit Courtney's house to share news about their end-of-seventh-grade sleepover. Unbeknownst to them, they meet the real Alison who’s home visiting.
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Alison pushes Courtney into the big hole that was dug for the new gazebo being built the next day. Courtney stops being able to speak and move after the fall and is quickly fading. As she’s dying, Nick, who’s been infiltrating her life, joins Alison, and Courtney dies with the shock of her sister and Nick’s betrayal.
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Mrs. DiLaurentis questions Spencer, Hanna, Emily, and Aria about Courtney's whereabouts after she failed to return home from their sleepover the night before.
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The Montgomery's move to Iceland.
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Grace leaves Rosewood and goes to boarding school in Connecticut.
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The DiLaurentis family moves away from Rosewood.
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Grace frames her friend Kelsey as a dealer by putting drugs in her room so Grace won't get any charges.
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Grace gets back from boarding school and back to Rosewood.
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The Montgomery family comes back to Rosewood.
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Aria gets sent the first A (Mona) Message saying: "Maybe he fools around with students all of the time. A lot of teachers do. Just ask your dad. -A"
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Courtney's body is found when demolishing the gazebo in her old backyard.
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Courtney's funeral takes place.
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Toby returns to Rosewood after three years in the juvenile facility.
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The police arrest Toby for Alison's murder.
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Hanna figures out Mona is A after she mistakenly sends a text from her personal phone number. A (Mona) hits Hanna with a car, putting Hanna in a two-day coma and then forgetting everything.
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Due to lack of evidence, Toby Cavanaugh is released from prison.
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Ian gets arrested for killing Courtney after Mona said he was the killer during her and Spencer's altercation.
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Hanna remembers that Mona is A after finally remembering the night of her accident.
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Mona falls off a cliff at Floating Man Quarry and dies after getting into a physical altercation with Spencer.
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Iris tells Hanna that Courtney (Alison) left the preserve in November.