"In England, you get a lot of staring and no approaches, while here it is more full on," he said.
His biggest fan base seems to be in Japan, where he gets most of his letters, including "SpongeBob merchandise and PJs, for some reason," he said.
When Grint is not at the Hogwarts School of Witchcraft and Wizardry as Harry Potter's sidekick, he can be found driving his "Mr. Whippy" ice-cream truck -- a pink Bedford 1976 CF. The ice-cream is free, and the lines of fans queuing up for it are long. Why does he own it?
"My dream when I was younger was to buy an ice-cream van," he said.
It's a far more comfortable ride than Grint's broom for his Quidditch scenes in "The Half-Blood Prince."
"It's tricky," he said of the scenes. "There's nothing but me in front a green screen with someone throwing balls at me. It's quite uncomfortable sitting on a broom for long periods of time."
"Harry Potter and the Half-Blood Prince" will be in theaters July 15.