Mroźna Cave is the only tourist-accessible cave in the Kościeliska Valley and one of the most unique underground experiences the Polish Tatra Mountains have to offer. A constant temperature of just 6°C, cool air currents and white calcite formations resembling frost give the cave an almost magical, wintry atmosphere — even in the height of summer. It is a perfect destination for families, casual hikers and underground explorers alike.

Stretching 773 metres in total length, the cave guides you through a fascinating variety of spaces: tall, narrow passage-fissures, the impressive Great Chamber measuring 25×10 metres, the mysterious Sabała's Lake and a cluster of stalagmites in the section known as 'the Garden'. Despite being considered modest in scale for the Tatras, Mroźna boasts the richest speleothem decoration of all publicly accessible caves in the Polish Tatras — with stalactites, stalagmites, flowstones, draperies and moonmilk. Look out especially for the brown 'Curtain' flowstone just beyond the Great Chamber and the beautifully adorned small chamber beside 'the Garden'. The cave is damp throughout, and in places an underground 'rain' drips steadily from the ceiling.

• Stare Kościeliska meadow (Kościeliska Valley) — black trail, starting from the wooden footbridge near Lodowe Źródło (Ice Spring); approx. 20–30 min walk to the cave entrance, easy

• Open from early May to the end of October
• You must bring your own torch/headlamp — artificial lighting was removed during the 2023 renovation
• Entrance fee: 10 PLN — the only Tatra cave with a paid admission
• Tour duration: 20–40 minutes; one-way route entering from the northern artificial tunnel and exiting via a separate descent path
• Temperature inside: approx. 6°C year-round — bring a warm layer

The cave was discovered in May 1934 by Stefan Zwoliński and Jerzy Zahorski, and opened to the public in July 1953. For over six decades it held the distinction of being the only electrically lit cave in the Polish Tatras, powered by a diesel generator.