WARNING! SPOILERS AHEAD!

The following timelines combine information from 'Halloween' Wikipedia pages, dialogue and various dates from the films themselves. These timelines are not absolutely definitive, and certain situations are debatable and always will be due to the simplicity of human error.
  • Legacy Character
  • Secondary but Important Character
  • Timeline Name

OLD-SCHOOL TIMELINE

PRE-HALLOWEEN HISTORY

1963:
  • Six-year-old Michael Myers murders his older sister, Judith Myers, on Halloween night.
  • Michael Myers is sent to Warren County's Smith's Grove Sanitarium for the next fifteen years, where he is mainly under the care of Dr. Samuel Loomis.

EVENTS OF 'HALLOWEEN' TAKE PLACE

Film Timeline:
  • Begins late on Monday, October 30, 1978 - Ends late on Tuesday, October 31, 1978
  • Film begins all timelines, except for the "Zombie" timeline

For deaths, see 'Halloween' Morgue, 1978 (coming soon)

EVENTS OF 'HALLOWEEN II' TAKE PLACE

Film Timeline:
  • Begins late on Tuesday, October 31, 1978 - Ends early on Wednesday, November 1, 1978
  • Film ends the "Old-School" timeline but branches off to the "Thorn" timeline and the "First Strode Reset" timeline
  • 'Halloween' and 'Halloween II' can still work as a stand-alone project, following the original plan to make the series an anthology

For deaths, see 'Halloween II' Morgue, 1981 (coming soon)

SEPARATE UNIVERSE

EVENTS OF 'HALLOWEEN III: SEASON OF THE WITCH' TAKE PLACE

Film Timeline:
  • Begins late on Saturday, October 23, 1982 - Ends late on Sunday, October 31, 1982
  • Film stands alone outside of any timelines as well as the universe itself, as 'Halloween' ('78) is a movie within this movie
  • Film follows the original concept of making the 'Halloween' series an anthology, with the first two films counting as one story

For deaths, see 'Halloween III' Morgue, 1982 (coming soon)

THORN TIMELINE

Late 1970s:
  • (more info to come)
1980-1988:
  • (more info to come)

EVENTS OF 'HALLOWEEN 4: THE RETURN OF MICHAEL MYERS' TAKE PLACE

Film Timeline:
  • Begins late on Sunday, October 30, 1988 - Ends late on Monday, October 31, 1988
  • Film picks up from 'Halloween II', ten years later, and follows the "Thorn" timeline

For deaths, see 'Halloween 4' Morgue, 1988 (coming soon)

EVENTS OF 'HALLOWEEN 5: THE REVENGE OF MICHAEL MYERS' TAKE PLACE

Film Timeline:
  • Begins late on Monday, October 31, 1988 - Ends late on Tuesday, October 31, 1989
  • Film picks up from 'Halloween 4' and follows the "Thorn" timeline

For deaths, see 'Halloween 4' Morgue, 1988 (coming soon)