As spring tightens its grip on the Alps, European mountain resorts are issuing what might be the most obvious — and apparently most ignored — public safety message of the season: don’t walk on melting lakes. Yet despite rising temperatures and visibly thinning ice, visitors are still venturing onto frozen surfaces across the Alps. In recent days, several resorts reported rescues of people breaking through the thin ice into the frigid water below and needing rescuing, and in some cases, hospitalization for hypothermia. Now, several municipalities have had to issue official decrees or bans to prevent those who are too stubborn to heed warning signs or apply common sense.
In Tignes, France, the mayor has taken the most direct approach, issuing a formal decree prohibiting access to the resort’s iconic frozen lake. The Lac de Tignes, a centerpiece of the high-altitude ski town throughout winter, becomes increasingly unstable in April as longer days and stronger sun exposure weaken the ice from both above and below. What looks solid can quickly turn into a slushy, fractured surface incapable of supporting weight.
Across the border in St. Moritz, Switzerland, where frozen lakes are practically part of the resort’s identity — hosting everything from vintage car racing to snow polo in midwinter — authorities have also raised the alarm. Officials are urging visitors to stay off the ice entirely as spring conditions accelerate melting, even at altitude. Several people have fallen into the lake in recent days despite official closures.
Further to the south in Italy, concerns have been echoed at Pragser Wildsee (or Lago di Braies in Italian), one of the Dolomites’ most photographed locations. The lake’s picturesque frozen surface may still look inviting on Instagram, but local authorities have cautioned that the ice is no longer reliable — despite appearances. Two children fell through the thin ice layer this week, prompting family members to rush to their aid, only to find themselves breaking through the ice as well.
The problem is deceptively simple. Spring brings warmer air temperatures, stronger solar radiation, and longer daylight hours. Even when overnight freezes occur, they often fail to fully refreeze the weakened ice structure. Beneath the surface, water currents and warming temperatures can further erode thickness, creating hidden weak spots. The South Tyrol fire department urges, “Our appeal is: don’t walk on the lake anymore and respect the signs present,” stressing that these incidents can quickly become life-threatening.
In other words: that scenic shortcut across the lake: it’s not a shortcut — it’s a gamble.
