Buildings Hogwarts

The secret passage on fourth floor collapses

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The Harry Potter Canon

"Don't bother with the one behind the mirror on the fourth floor. We used it until last winter, but it's caved in -- completely blocked."
-- Fred Weasley (PA10)

A very roomy secret passage to Hogsmeade was located behind a big mirror on the fourth floor, but it caved in during the winter of 1992-1993 (PA10).

Timeline Notes

The term "last winter" could mean anytime between the end of November 1992 through February 1993, but in order to fit it on the timeline we are assigning it a date of January 1993. The season and year are canon, the exact month is just a reasonable guess.

The secret passage on fourth floor collapses
Date January, 1993
Certainty Reasonable guess
Location in Canon PA10
Type of Event Wizarding world