2015

The following is about significant events that happened in 2015.

January

• 1 - The first wave of 2015 LEGO Ninjago sets were officially released in Europe.
• 20 - LEGO Ninjago: Masters of Spinjitzu Season 3 volume 2 was released on DVD in the United States.
• 27 - An activity book named "The Tournament of Elements" was released.

February

• 23 - Season 4 episodes 1 & 2, "The Invitation" and "Only One Can Remain," aired in the United States.
• 24 - The books "The Search for Zane" and "The Rescue Mission" were released.

March

• 1 - The first wave of 2015 LEGO Ninjago sets were officially released in the United States.
• 9 - Season 4 episode 3, "Versus" aired in the United States.
• 16 - Season 4 episode 4, "Ninja Roll" aired in the United States.
• 23 - Season 4 episode 5, "Spy for a Spy" aired in the United States.
• 27 - LEGO Ninjago: Shadow of Ronin was released.
• 30 - Season 4 episode 6, "Spellbound" aired in the United States.
• 31 - Season 4 episode 7, "The Forgotten Element" aired in the United States.

April

• 1 - Season 4 episode 8, "The Day of the Dragon" aired in the United States.
• 2 - Season 4 episode 9 "The Greatest Fear of All" aired in the United States.
• 3 - Season 4 episode 10 and finale, "The Corridor of Elders" aired in the United States.
• 28 - Ninja vs. Ninja and Breakout! were released.

June

• 1 - The second wave of 2015 LEGO Ninjago sets and Airjitzu Flyers were officially released in Europe.
• 16 - Secret World of the Ninja was released.
• 29 - Season 5 episode 1, "Winds of Change" aired in the United States.
• 30 - Season 5 episode 2, "Ghost Story" aired in the United States.

July

• 1 - Season 5 episode 3, "Stiix and Stones" aired in the United States.
• 2 - Season 5 episode 4, "The Temple on Haunted Hill" aired in the United States.
• 3 - Season 5 episode 5, "Peak-a-Boo" aired in the United States.
• 6 - Season 5 episode 6, "Kingdom Come" aired in the United States.
• 7 - Season 5 episode 7, "The Crooked Path" aired in the United States.
• 8 - Season 5 episode 8, "Grave Danger" aired in the United States.
• 9 - Season 5 episode 9, "Curseworld, Part I" aired in the United States.
• 10 - Season 5 episode 10 and finale, "Curseworld, Part II" aired in the United States.
• 28 - Spy vs. Spy was released.

August

• 1 - The second wave of 2015 LEGO Ninjago sets and Airjitzu Flyers were officially released in the United States.
• 25 - World of Ninjago: Official Guide was released.

September

• 29 - Tournament of Elements book and The Way of the Ghost were released.

December

• 29 - Attack of the Sky Pirates was released.