Their first view of Hogwarts is a shining castle reflected in the dark Lake. They glide through a curtain of ivy to a small, hidden pebble beach where they disembark, walk up a path, and come to the massive wooden front doors.
Across the Lake to Hogwarts castle
Date evening September 1st, 1991
Certainty Stated in canon
Location in Canon PS6
Type of Event Wizarding world