Welcome to the Antarctic Ice Ultra™ – the ultimate endurance footrace on the frozen continent. The 2025 event offers various distances, including half marathon, marathon, 50k, 81k (50 miles), 100k, and up to 100 miles. This unique race is what you’ve been looking for to test your limits in the most extreme conditions on Earth.
The 2025 Antarctic Ice Ultra™ is scheduled to take place at Schirmacher Oasis in Eastern Antarctica on November 8th 2025. Registration is now open and spots are allocated on a first-come first-serve basis.
The Antarctic Ice Ultra™ , the Ultimate Polar Ultra, is organized by Runbuk, Inc.. In addition to organizing this ultra event, Runbuk organizes the World’s Southernmost Marathon – the Antarctic Ice Marathon®, the world’s most northerly marathon, the North Pole Marathon®, and the World Marathon Challenge® (7 Marathons 7 Continents 7 Days®️
Acclimatisation is not mandatory for the Antarctic Ice Marathon. The race occurs at 600m so there should be no altitude-related issues.
The main challenges from a running perspective are the Cold and the Underfoot Terrain.
Cold: The correct clothing is an essential element in dealing with the cold. Please refer to the Race Gear section for information on clothing.
Underfoot Terrain: The underfoot terrain can be energy sapping in places, though the snow will not be deep: the course will be groomed beforehand so it should be reasonably solid, but not always.
