Grand Slam of Ultra-Running

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Old Dominion 100 2025

Woodstock, Virginia Woodstock, VA, United States

Last Updated June 9, 2024 The Old Dominion 100 2025 is a 100-mile ultramarathon that is run annually in the mountains of Virginia, USA. The event has a rich history dating back to 1979 when it was founded by Pat and Wayne Botts and designed to allow East Coast runners to complete 100 miles on…

Event Series Grand Slam of Ultrarunning

Western States 100 2025

Olympic Valley, California Olympic Valley, CA, United States

Updated July 20, 2024 -- The 2025 event date is not confirmed -- The Western States 100 is an epic 100-mile trail from Olympic Valley to Auburn, CA, in one day on the last weekend of June. It is the world's oldest 100 trail race, starting in 1974 as one of the ultimate endurance tests…

Event Series Grand Slam of Ultrarunning

Vermont 100 Endurance Race 2025

Killington, Vermont Killington, VT, United States

Last updated August 24, 2024-- The Vermont 100 Endurance Race is an annual premier ultra trail event in July and a Grand Slam of Ultrarunning events.  Racers can register for either the 100-mile or the 100-km race. Although the event's roots go back to the 1960s, the endurance event as we know it today was…

Leadville Trail 100 Run 2025

Leadville, Colorado Leadville, CO, United States

Updated September 11, 2024 -- The 2025 event date is not confirmed -- In the heart of the Colorado Rockies lies an event that embodies the essence of endurance, tenacity, and the indomitable spirit of trail running - the penultimate Leadville Trail 100 Run, also known as "Race Across the Sky". The LT100 is the…

Event Series Grand Slam of Ultrarunning

Wasatch Front 100 2025

Kaysville, Utah Kaysville, Utah, UT, United States

Last updated September 23, 2024 The Wasatch Front 100, also known as "100 miles of heaven and hell", is one of the most uniquely challenging ultrarunning events in the world. This prestigious 100-mile endurance run is the culminating event in the Grand Slam of Ultra-Running series. It is held in Utah the first Friday and…