Platform 9¾

Platform 9¾ is the platform from which the Hogwarts Express may be boarded on September the 1st. The platform has, on September the first, a sign hanging over the scene reading: Hogwarts Express, eleven o'clock, and there is a wrought iron archway bearing the words Platform Nine and Three Quarters over the entry/exit to the platform. At the conclusion of the school year, the Hogwarts Express returns to King's Cross bearing the students of Hogwarts back for their summer holidays. It can be assumed that the sign over the platform changes on the day the train returns from Hogwarts.

In order for someone to get onto Platform 9¾, they must walk directly at the apparently solid barrier dividing platforms nine and ten. Mrs. Molly Weasley advises that one should "do it at a bit of a run if you're nervous." It is not known exactly how Muggles do not, or cannot get onto the platform; however, it can be assumed that powerful magic of some sort is employed in order to keep them ignorant of its existence.