Stephanie Case has made history by becoming the first woman to complete a 100-mile ultramarathon in Antarctica. The 43-year-old Canadian ultrarunner achieved this remarkable feat on 9 November 2026 during the Antarctic Ice Ultra held in Schirmacher Oasis, Queen Maud Land, East Antarctica. She finished second overall in the race with a time of 17 hours, 31 minutes and 39 seconds. Her performance established the first women’s record for the 100-mile distance on the Antarctic continent and marked an important moment in international endurance sports.

Stephanie Case Creates History in Antarctica

Stephanie Case achieved a historic milestone by completing the challenging 100-mile race in one of the coldest regions on Earth. The race covered a distance of 160.9 kilometres and tested the physical strength, mental focus and endurance of every participant.

Case became the first woman to complete this distance in Antarctica. She also finished second among all competitors, including male runners.

Her achievement was particularly impressive because the race took place in extreme weather conditions. Running for several hours in freezing temperatures requires special preparation, suitable clothing and strong mental determination.

The Antarctic Ice Ultra is known for its difficult environment, where runners face snow, ice, strong winds and extremely low temperatures.

Antarctic Ice Ultra 2026 and Race Conditions

The Antarctic Ice Ultra 2026 was organised in Schirmacher Oasis in Queen Maud Land, East Antarctica. The race covered 38 loops of a 4.2-kilometre course, along with an additional section to complete the full 100-mile distance.

The weather conditions made the competition even more difficult. Temperatures dropped to minus 35 degrees Celsius, while strong winds affected the runners throughout the event.

According to the organisers, these were the coldest conditions recorded for the race. Due to an approaching storm, the starting time was changed to 1 am to help participants complete the event under safer conditions.

A total of eight runners started the 100-mile race, but only four managed to finish the full distance. Three women participated, and Stephanie Case was the only woman to complete the challenge.

Her ability to maintain a steady pace and continue running in such difficult conditions made her achievement even more special.

Stephanie Case Finishes Second Overall

Stephanie Case completed the 100-mile Antarctic race in 17 hours, 31 minutes and 39 seconds. She finished 29 minutes and 15 seconds behind the overall winner, Chinese runner Yusheng Ni.

Yusheng Ni completed the race in 17 hours, 2 minutes and 24 seconds, setting a men’s continental record for the distance.

Although Case did not finish first overall, her achievement was historic because no woman had previously completed a 100-mile race in Antarctica.

The performance also showed that women can compete at a high level in some of the world’s most demanding endurance events.

Who Is Stephanie Case?

Stephanie Case is a Canadian ultrarunner and international human rights lawyer. Along with her sporting career, she is also known for her work supporting women and girls through her charity, Free to Run.

The organisation works to provide opportunities for women and girls affected by conflict and social difficulties to participate in sports and outdoor activities.

Case has used running as a platform to raise awareness about women’s participation in sports and the importance of equal opportunities.

Her personal journey has attracted attention because she has balanced professional responsibilities, motherhood and long-distance running.

In May 2025, she also received attention after breastfeeding her daughter, Pepper, during an ultramarathon victory in Snowdonia. The moment highlighted the challenges faced by mothers who continue participating in competitive sports.

What Is an Ultramarathon?

An ultramarathon is a running event that covers a distance longer than the traditional marathon distance of 42.195 kilometres.

These races can cover different distances, such as 50 kilometres, 100 kilometres and 100 miles. Some ultramarathons are also organised according to time, where participants try to cover the greatest possible distance within a fixed period.

Unlike ordinary road races, ultramarathons may take place on mountain trails, deserts, forests, roads, snow-covered routes and other challenging landscapes.

Some events use repeated loops of a particular course, while others follow long routes from one location to another. Participants need proper training, physical fitness, nutrition and mental strength to complete these races.

Challenges of Running in Antarctica

Antarctica is one of the most challenging places in the world for outdoor sports. Extremely low temperatures, strong winds, snow and ice make physical activities difficult.

Runners participating in Antarctic races must prepare for cold-weather conditions. They need specialised clothing, protective equipment and suitable footwear to reduce the risks associated with freezing temperatures.

Maintaining body temperature is especially important during long-distance races. Continuous physical activity in extreme cold can place additional pressure on the body.

Stephanie Case’s achievement demonstrates the level of preparation and endurance required to complete such a difficult sporting challenge.

Her historic performance in the Antarctic Ice Ultra 2026 has brought international attention to ultrarunning and women’s participation in extreme endurance sports. It has also highlighted the growing interest in challenging sporting events held in some of the world’s most remote environments.