It isn't known but since he was still at school probably not very long before the World Cup.
Viktor eventually found love with a woman from his native Bulgaria.
Bulgaria.Bulgaria.Bulgaria.Bulgaria.
Viktor Krum.
Bulgaria
In the books it does not say who Viktor wanted to marry but J.K Rowling has said that when Krum returns to Bulgaria he finds a Bulgarian girl and marries her.
Viktor Krum plays as a Seeker for the Bulgarian Quidditch team.
Viktor Krum was a student at Durmstrang.
In both the book and film series, Viktor Krum only appears once on a broomstick. That one time was during the finals of the 1994 Quidditch World Cup; Ireland vs Bulgaria. in that scene, Krum was using a Firebolt broomstick.
J.K. Rowling only wants English actors in her movies, Viktor Krum was from Bulgaria in the book so it might make sense that he is also from Bulgaria in real life.
The Bulgarian National Quidditch Team's Seeker. He is also Durmstrangs champion for the Twiwizard Tournament in the fourth Harry Potter book, though Harry wins, of course (and Cedric along with him, I guess).
Bulgaria!
Gregorovitch made Krum's wand.