Stranger Things Timeline

First half of the 1900s
Birth of the oldest players.
1950s
Henry's first posession; the Creel Murders (TFS)
1960s
The Hawkins Lab experiments begin.
1970s - early 80s
Birth of the kids, Hopper returns, Hawkins massacre, Eleven experiments.
1983
The gate opens and Demogorgon rampage (ST1)
1984
Mind Flayer posession and creature invasion (ST2)
1985
Russian presence in Hawkins; Mind flayer extends physically (ST3)
1986
Vecna's curse and diimensional rupture (ST4)

1959 - Henry Creel's first posession (TFS)

War Between Hawkins and the Upside Down

1983 - The gate opens and Demogorgon rampage (ST1)

1984 - Mind Flayer posession and creature invasion (ST2)

1985 - Russian presence in Hawkins; Mind flayer extends physically (ST3)

1986 - Vecna's curse and diimensional rupture (ST4)