Case Runs First Women's 100-Mile at Antarctic Ice Ultra

The Canadian ultrarunner became the first woman to complete 100 miles at the Antarctic Ice Ultra, stopping the clock at 17:31:39 on 8 November 2026.

She finished less than 30 minutes behind overall winner Yusheng Ni, the man who had set the previous 100-mile mark of 22:40:47 a year earlier. The women's entry on the official list had been vacant. Case did not just claim it — she covered the distance more than five hours faster than that existing overall mark.

A race run in a freezer

The Antarctic Ice Ultra began that day across several distances, and the women came out strong. Amy Passauer won the marathon overall, Shakiya Nugent took the 50 km outright, and Marian Danila claimed the 100 km.

Conditions tested every competitor. At the 2025 edition, temperatures dropped from around −15 °C to −32 °C during the race.

A prize on a blank page

Case arrived with a pedigree built across terrain and distance. She also knew the man she had to chase: earlier in 2026, at the Hong Kong 100, she finished 36 minutes ahead of Ni.

The first women's 100-mile mark in Antarctica now carries her name — no asterisk, no vacancy, just a number that will be hard to shift.