The competition organized by the Fideriser Heuberge ski resort in the canton of Graubünden offered one lucky winner access to 15 kilometres of ski pistes, a 12-kilometre sled run and beds for 220 people in three mountain lodges.
Frei and his friends turned up last Sunday to enjoy the prize valued at an estimated 100,000 Swiss francs (€89,000). They were set to stay from Sunday 4pm to Monday 4pm.
Things started well, with drinks, fondue and night skiing on Sunday but then the weather decided it wasn't going to play along.
On Sunday night, there was heavy snowfall and an avalanche. Roads back down into the valley were subsequently closed because of snow and fallen trees.
Ein ganzes Skigebiet, 24 Stunden lang, exklusiv für sich und seine Freunde – Thomas Frei darf einen Tag im Skigebiet Fideriser Heuberge regieren und dazu 999 Personen einladen. (Abo+) https://t.co/6V27ZdWrTl— SonntagsZeitung (@sonntagszeitung) January 13, 2019
With forest workers unable to clear the roads of trees because of the snow, Frei and his friends found themselves snowed in.
Ski lifts opened briefly on Monday morning but another winter storm forced their closure, Swiss news site 20 Minuten reported.
“We are making the best of the situation,” said Frei on Monday as the prospect of a Monday departure from the resort looked slim.
“It would have been nice to have good weather, but this is OK with me,” he said.
Another guest also saw the bright side of the situation. “There are also positive aspects [of being stuck indoors]. We are talking to each other a lot and meeting new people,” the guest said.
Frei and his friends were finally able to leave the resort on Tuesday at around 6pm, or a little over 24 hours later than planned, a spokesperson for Fideriser Heuberge told The Local.
Their departure was made possible after a helicopter was used to set explosives in eight different locations to trigger avalanches, the spokesperson said. The roads into the resort were then cleared.
Conditions at the resort on Wednesday are described as "perfect", with bright sunshine.
Many parts of the Swiss Alps are currently at level 3 (or “considerable”) risk for avalanches after heavy snow in recent times.
The Swiss snow and avalanche research institute, the SLF, is warning inexperienced people to stay on open ski runs and trails.
On Tuesday, a 20-year-old Swedish woman died while skiing off piste in the canton of Valais, while on Monday a ski patroller died in the same canton while he and a colleague where laying explosives in a bid to ensure the safety of pistes at huge Portes du Soleil ski area.