The 14-day event in late August-early September is expected to attract several hundred athletes.
It will be the first time the event has been held in the southern hemisphere.
Chief executive Ross Palmer said it was a great honour and "a clear signal" from the international sporting community there was a high level of confidence in New Zealand's ability to host major international winter sporting events.
"It's another feather in the cap for snow sports in New Zealand . . . for all of our sports, to have an event of the quality of the Winter Games New Zealand and to follow it up with another major event next year . . . it's just huge.
"It's definitely going to be [in the Lakes district] - there's really no other place in the country that has the facilities . . . to accommodate an event of this size."
While the FIS has awarded the championships to New Zealand, and venues have not yet been confirmed, Mr Palmer said it had indicated it wanted the event to be staged in Queenstown and Wanaka.
"As the current season winds down, we'll have formal discussions with the ski area operators to gauge their interest in being part of this event and to ensure that we are able to fit comfortably into their schedules during a busy time of the season," he said.
Winter Games chief executive Arthur Klap has already agreed to be the event organiser for the junior world championships.
"That's a big assistance . . . to have somebody of Arthur's stature, and his obvious ability, to ensure the event goes well... It gives me a lot of confidence."
Mr Palmer expected several hundred athletes would attend, along with their support crews and families, many of whom would stay longer than two weeks, which would provide "another big boost to the local economy".
Adding to the numbers would be the decision to combine the snowboarding and freeski events - the first time the two events would share the stage in a world championship, he said.
A full programme of snowboard disciplines would be open to male and female competitors under 20, including halfpipe, snowboard cross, parallel giant slalom, big air and slopestyle.
A final schedule will be announced next month, shortly after the FIS annual meeting in Zurich.
