Suzumiya Haruhi:Timeline

Here's the current timeline of the Suzumiya Haruhi novels, courtesy of Sushi-Y's post from the AnimeSuki.com forums and MOONPHASE:

Story Timeline

(titles in italic are stories that span the entire volume)

• April ~ May
  • 涼宮ハルヒの憂鬱 (The Melancholy of Suzumiya Haruhi) [From: 涼宮ハルヒの憂鬱, vol.1]

• June
  • 涼宮ハルヒの退屈 (The Boredom of Suzumiya Haruhi) [From: 涼宮ハルヒの退屈, vol.3]

• July
  • 笹の葉ラプソディ (Bamboo Leaf Rhapsody) [From: 涼宮ハルヒの退屈, vol.3]
  • ミステリックサイン (Mysterious Sign) [From: 涼宮ハルヒの退屈, vol.3]
  • 孤島症候群 (Lone Island Syndrome) [From: 涼宮ハルヒの退屈, vol.3]

• August
  • エンドレスエイト (Endless Eight) [From: 涼宮ハルヒの暴走, vol.5]

• November
  • 涼宮ハルヒの溜息 (The Sighs of Suzumiya Haruhi) [From: 涼宮ハルヒの溜息, vol.2]
  • ライブアライブ (Live A Live) [From: 涼宮ハルヒの動揺, vol.6]
  • 朝比奈ミクルの冒険 Episode 00 (Asahina Mikuru's Adventure Episode 00) [From: 涼宮ハルヒの動揺, vol.6]
  • 射手座の日 (The Day of Sagittarius) [From: 涼宮ハルヒの暴走, vol.5]

• December
  • 涼宮ハルヒの消失 (The Disappearance of Suzumiya Haruhi) [From: 涼宮ハルヒの消失, vol.4]
  • ヒトメボレLOVER (Charmed at First Sight LOVER) [From: 涼宮ハルヒの動揺, vol.6]
  • 雪山症候群 (Snow Mountain Syndrome) [From: 涼宮ハルヒの暴走, vol.5]
  • 猫はどこに行った？ (Where Did The Cat Go?) [From: 涼宮ハルヒの動揺, vol.6]

• January
  • 朝比奈みくるの憂鬱 (The Melancholy of Asahina Mikuru) [From: 涼宮ハルヒの動揺, vol.6]

• February
  • 涼宮ハルヒの陰謀 (The Intrigues of Suzumiya Haruhi) [From: 涼宮ハルヒの陰謀, vol.7]

• March
  • 編集長★一直線！ (Editor In Chief ★ Straight Ahead!) [From: 涼宮ハルヒの憤慨, vol.8]
  • ワンダリング・シャドウ (Wandering Shadow) [From: 涼宮ハルヒの憤慨, vol.8]

• Extra
  • 涼宮ハルヒ劇場 (Suzumiya Haruhi Theater) [From: The Sneaker 2004 August issue, not yet compiled]
  • 帰ってきた涼宮ハルヒ劇場 (The Return of Suzumiya Haruhi Theater) [To be published: The Sneaker 2006 June issue]

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Alternatively, if you don't like reading all that Japanese text, here is a list compiled by Kinny Riddle:

To novel readers, especially those reading the translated wiki project, here's a spoiler-free chronological timeline to guide you on what you need to read without missing anything. Bold indicates major plot development worth reading in order to understand what happens next.

• Volume 1
• Volume 3 - The Boredom of Suzumiya Haruhi
• Volume 3 - Bamboo Leaf Rhapsody (ties in with volume 4)
• Volume 3 - Mysterique Sign
• Volume 3 - Lone Island Syndrome
• Volume 5 - Endless Eight
• Volume 2
• Volume 6 - LIVE ALIVE
• Volume 6 - Asahina Mikuru's Adventure Episode 00
• Volume 5 - The Day of Sagittarius
• Volume 4
• Volume 6 - Crazy LOVER
• Volume 5 - Snow Mountain Syndrome (loose sequel to Lone Island Syndrome)
• Volume 6 - Where Did the Cat Go? (loose sequel to Lone Island Syndrome)
• Volume 6 - The Melancholy of Asahina Mikuru (ties in with volume 7)