Classic Timeline

In this timeline, all of the canon Ben 10 episodes take place.

It is the timeline where nearly the entire Ben 10 series take place. Gwen 10, Goodbye and Good Riddance, Ken 10, Ben 10: Race Against Time, and all of the video games released as well as comics didn't happen in this timeline.

231-1900

 * 231: Sir George is born.
 * Prior to 1131: Destruction of the incursion homeworld takes place.
 * 1131: Sir George acquires Ascalon via Azmuth.
 * After 1131: Azmuth creates the Unitrix and the Prototype Omnitrix.
 * The Forever Knights are founded by Sir George.
 * The Forever Knights kidnap a map making alien dragon.

20th Century

 * Summer 1946: Max Tennyson is born.
 * 1950s: Paradox's Machine fails, sending him out of time for 100,000 years.
 * 1963: Max meets Verdona along with the Synthroid.
 * 1960s: Max is discharged from the Air Force in order to be an astronaut.
 * 1960s: Magister Labrid invites Max to become a Plumber.
 * 1960s-1970s: Max becomes a Plumber.
 * Early 1990s: Ken Tennyson is born.

December
1996 - 1999:
 * Kevin Levin is born.
 * Ben and Gwen Tennyson being born roughly a year later.
 * Devin Levin is murdered by Ragnarok.
 * Mrs. Levin marries Harvey Hackett.

2000's
Prior to Kevin 11: Kevin destroys his house due to his insanity, then runs away thinking his stepdad's punishment was to kick him out on the street.

Unknown

 * Mrs. Levin Divorces Harvey.

Summer 2006
The events of Ben 10 and take place.
 * Azmuth begins his work on his real Omnitrix.

2006 - 2007

 * The events of Ben 10: Destroy All Aliens take place.
 * The past events of Ben 10: Omniverse take place.

2007 - 2010

 * Ben removes the Omnitrix.

1-2 years ago

 * The events of Ben 10: Alien Force take place.
 * Prior to Ultimate Alien: Aggregor kidnaps five Andromeda Aliens.

Present
Future (Current)
 * The events of Ben 10: Alien Swarm take place
 * The events of Ben 10: Ultimate Alien take place.
 * The present events of Ben 10: Omniverse take place.
 * According to Derrick The future is constantly in motion and changing.

Future (Possible)
These events have taken place past the present series and are still considered possible, but not definite.
 * 2022: The Plutonian Wars take place, and Ben may or may not start calling himself Ben 10,000 after the war.
 * 2032: Ben goes back in time to meet his younger self.