2009 (MMIX) was a common year of the Gregorian calendar that started on a Thursday.
2009 was the 9th year of the 3rd millennium, 21st century, and the 2000's decade. The year aired the second half of the 6th season and very early episodes in Season 7.
| Date | Event(s) | |
|---|---|---|
| January 1 | Club SpongeBob and My Pretty Seahorse premiered in Poland. | |
| January 4 | Pressure and The Smoking Peanut premiered in Poland. | |
| January 8 | Procrastination and I'm with Stupid premiered in Poland. | |
| January 10 | Nasty Patty and Idiot Box premiered in Poland. | |
| January 15 | Mermaid Man and Barnacle Boy IV and Doing Time premiered in Poland. | |
| January 18 | Wet Painters and Krusty Krab Training Video premiered in Poland. | |
| January 21 | As Seen on TV and Can You Spare a Dime? premiered in Poland. | |
| January 24 | Snowball Effect and One Krabs Trash premiered in Poland. | |
| January 27 | The DVD, Spongicus, was released. No Weenies Allowed and Squilliam Returns premiered in Poland. | |
| January 31 | SpongeBob Meets the Strangler and Pranks a Lot premiered in Poland. "Slide Whistle Stooges" premiered in Australia. | |
| February 4 | Lux Interior died. | |
| February 5 | Krab Borg and Rock-a-Bye Bivalve premiered in Poland. | |
| February 16 | Shuffleboarding and Slide Whistle Stooges premiered. | |
| February 17 | Cephalopod Lodge premiered. | |
| February 18 | Grandpappy the Pirate premiered. | |
| February 19 | Professor Squidward premiered. | |
| February 24 | SpongeBob vs. The Big One: Beach Party Cook-Off, SpongeBob's Greatest Hits, and Good Ideas... and Other Disasters were released. | |
| March 3 | SpongeBob vs. The Big One was released. | |
| March 10 | Surf's Up SpongeBob! was released. | |
| March 16 | Sand Castles in the Sand premiered. | |
| March 17 | Toy Store of Doom premiered. | |
| March 18 | Pets or Pests premiered. | |
| March 19 | Komputer Overload premiered. | |
| March 20 | Choir Boys premiered. | |
| April 17 | SpongeBob SquarePants vs. The Big One premiered. | |
| April 19 | SpongeBob SquarePants vs. The Big One premiered in Poland. | |
| April 20 | SpongeBob SquarePants vs. The Big One premiered in Canada. | |
| April 22 | SpongeBob & You Save the Big Blue, Educate and Activate, Educate and Activate 2, Separation Anxiety, Surfing Dreams, and SpongeBoard premiered. | |
| May 25 | SpongeBob StarPants was released. | |
| May 28 | Friend or Foe? premiered in Poland. | |
| June 1 | Shell Shocked premiered. | |
| June 2 | Pineapple Fever premiered. | |
| June 3 | Single Cell Anniversary premiered. | |
| June 4 | Squid's Visit premiered. | |
| June 5 | Gullible Pants premiered. | |
| June 9 | SpongeBob RoundPants and 10 Happiest Moments were released. | |
| June 11 | The Original Fry Cook and Night Light premiered in Poland. | |
| June 23 | Happiness to Go! was released. | |
| June 25 | Rise and Shine, Waiting, and Fungus Among Us premiered in Poland. | |
| July 9 | Spy Buddies, Boat Smarts, and Good Ol' Whatshisname premiered in Poland. | |
| July 10 | What Ever Happened to SpongeBob? premiered in Poland. | |
| July 17 | To SquarePants or Not to SquarePants premiered. The Ultimate SpongeBob Sponge Bash began. | |
| July 18 | Chum Caverns premiered. | |
| July 19 | The Ultimate SpongeBob Sponge Bash ended. Goo Goo Gas, No Hat for Pat, I ♥ Dancing, Someone's in the Kitchen with Sandy, Chum Bucket Supreme, Growth Spout, Tentacle Vision, The Inside Job, Stuck in the Wringer and Overbooked premiered. | |
| July 21 | The DVD, To SquarePants or Not to SquarePants, was released. | |
| July 23 | New Digs and Krabs à la Mode premiered in Poland. | |
| August 6 | Roller Cowards and Bucket Sweet Bucket premiered in Poland. | |
| August 27 | Money Talks, SpongeBob vs. The Patty Gadget, and Slimy Dancing premiered in Poland. | |
| September 3 | Comic Crazy! was released. | |
| September 4 | House Fancy and Krabby Road premiered in Canada. | |
| September 8 | The Great Escape was released. Walking Small and Squilliam Returns premiered in the Republic of Cyberia. | |
| September 10 | The Krusty Sponge and Sing a Song of Patrick premiered in Poland. | |
| September 22 | The First 100 Episodes was released. | |
| October 1 | Goo Goo Gas and Le Big Switch premiered in Poland. | |
| October 12 | SpongeBob Diner Dash was released. | |
| October 15 | Atlantis SquarePantis (part 2) premiered in Poland. | |
| October 24 | The Curse of Bikini Bottom premiered. | |
| October 26 | The game, SpongeBob's Truth or Square was released in North America. | |
| October 29 | Blackened Sponge and Mermaid Man vs. SpongeBob premiered in Poland. | |
| November 5 | Atlantis SquarePantis (part 1) premiered in Poland. | |
| November 6 | Truth or Square premiered. | |
| November 10 | the DVD, SpongeBob's Truth or Square was released. | |
| November 14 | Truth or Square premiered in Poland. | |
| November 26 | The Inmates of Summer and To Save a Squirrel premiered in Poland. | |
| November 27 | Greasy Buffoons and Model Sponge premiered. | |
| December 3 | Pest of the West premiered in Poland. | |
| December 8 | Balloons, Juice Man, Traffic, and The Outfit premiered. Season 6 Volume 1 was released. | |
| December 10 | 20,000 Patties Under the Sea and The Battle of Bikini Bottom premiered in Poland. | |
| December 17 | The Two Faces of Squidward and SpongeHenge premiered in Poland. | |
| December 26 | Jingle Brawl was originally released on Nick.com. | |
| December 31 | Banned in Bikini Bottom and Stanley S. SquarePants premiered in Poland. | |