Ontario's only WSER qualifier — 8 loops of Carolinian forest since 1992
Canada's oldest ultramarathon takes runners on eight 20K loops through the Dundas Valley Conservation Area, accumulating 4,160m of elevation gain on a mostly double-track Carolinian forest circuit. Natural springs, waterfalls, and old-growth hardwood canopy line the course as runners pass through the start/finish crew area after each loop. The final laps unfold after dark, with pacers joining from the 7th loop onward. As Ontario's only WSER qualifying race, sub-30-hour finishers earn a lottery ballot for the Western States Endurance Run, making this loop race punch well above its weight on the ultra calendar.
Some ultra experience recommended
Hamilton, ON, CanadaMay 23, 2026
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May weather in Hamilton, Ontario is unpredictable — temperatures typically range 12–25°C with possible rain that affects trail conditions
Overnight temperatures can drop significantly during the night loops — layers required for all 100M runners
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