The US ski team said Ronnie Berlack, 20, and Bryce Astle, 19, died in the incident near the Rettenbach glacier near Soelden, the venue for the annual season-opening World Cup races.
Berlack, from Franconia, New Hampshire, and Astle, from Sandy, Utah, were part of a group of six skiers who were descending from the 3,056-meter Gaislachkogel when they left the prepared slope and apparently set off the avalanche.
The other four skied out of the slide and escaped unhurt.
"Ronnie and Bryce were both outstanding ski racers who were passionate about their sport, both on the race course and skiing the mountain," US Ski and Snowboard Association
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President and CEO Tiger Shaw said. "Our hearts go out to the Berlack and Astle families, as well as to their extended sport family. Both of them loved what they did and conveyed that to those around them."
Berlack grew up racing in New Hampshire and had been a student-athlete at Vermont's Burke Mountain Academy.
Astle was invited to train with the development team this season after strong early season results, including two top-10 results at NorAm Cup races last month in Canada.
The tragedy has left the US ski team "in shock," Alpine director Patrick Riml told The Associated Press in Croatia, Zagreb, where the American slalom team was preparing for a night race tomorrow.
"We are all very close," said Riml, an Austrian who was born and grew up in Soelden. "We train a lot in Park City. We'll see how they handle the whole thing and how they react."