"The impossible has become possible!"
writes Nirmal Purja, one of the mountaineers who took part in the expedition, on Twitter in connection with the peak being reached at 5 pm on Saturday local time.
The mission is associated with danger to life.
Among those who previously tried to climb the 8,611 meter high mountain peak during the winter season, all have failed.
For some, the adventure has ended in death.
As recently as this weekend, a Spanish climber who was part of an expedition with the goal of reaching the mythical peak died.
K2, which is located on the border between China and Pakistan, is only 200 meters lower Mount Everest and is considered to be the most difficult mountain to climb during the winter.
Since the first attempt was made in 1987-1988, only a handful of winter expeditions have tried to cope with what was previously judged to be on the verge of the impossible.
The ten Nepalese climbers who have now entered the history books were initially part of three of the four competing expeditions that were in place at K2 this season.
But they later chose to join forces to climb the summit under the Nepalese flag.