Significant events that happened in 2018
January
- 1 - The Sons of Garmadon sets officially release around the world.
- 20 - The Mask of Deception airs in Australia.
- 27 - The Jade Princess airs in Australia.
February
- 3 - The Oni and the Dragon airs in Australia.
- 10 - Snake Jaguar airs in Australia.
- 17 - Dead Man's Squall airs in Australia.
- 24 - The Quiet One airs in Australia.
March
- 3 - Game of Masks airs in Australia.
- 10 - Dread on Arrival airs in Australia.
- 17 - True Potential airs in Australia.
- 24 - Big Trouble, Little Ninjago airs in Australia.
April
- 16 - The Mask of Deception airs in the US.
- 23 - The Jade Princess airs in the US.
- 30 - The Oni and the Dragon airs in the US.
May
- 7- Snake Jaguar airs in the US.
- 14- Dead Man's Squall airs in the US.
- 21 - The Quiet One airs in the US.
- 22- Game of Masks airs in the US.
- 23 - Dread on Arrival airs in the US.
- 24- True Potential airs in the US.
- 25- Big Trouble, Little Ninjago airs in the US.
June
- 1 - The Dragon Flyers release in the worldwide, and all of the Season 9 sets release in most countries.
- 30 - Firstbourne airs in Singapore.
July
- 5 - Iron & Stone airs in Singapore, Australia, and New Zealand.
- 6 - Radio Free Ninjago airs in Singapore.
- 7 - Iron & Stone airs in Australia and New Zealand.
- 10 - How to Build a Dragon airs in Singapore.
- 11 - The Gilded Path airs in Singapore.
- 12 - Two Lies, One Truth airs in Singapore.
- 13 - The Weakest Link airs in Singapore.
- 14 - Radio Free Ninjago airs in Australia and New Zealand.
- 17 - Saving Faith airs in Singapore.
- 18 - Lessons for a Master airs in Singapore.
- 19 - Green Destiny airs in Singapore.
- 21 - How to Build a Dragon airs in Australia and New Zealand.
- 28 - The Gilded Path airs in Australia and New Zealand.
August
- 1 - Season 9 sets release in the US.
- 4 - Two Lies, One Truth airs in Australia and New Zealand.
- 11 - The Weakest Link airs in Australia and New Zealand. The first four episodes of Season 9: Hunted also air in the US.
- 18 - The next four episodes of season 9 air in the US, and Saving Faith airs in Australia and New Zealand.
- 25 - The last two episodes of Season 9 air in the US, Australia, and New Zealand.
December
- 16 - The Season 10 teaser was released.