5 loops of Carolinian forest with WSER qualifying on the line
Other trail races within 187 miles
Five loops of the 20K Dundas Valley circuit total 100K with 2,600m of cumulative elevation gain. The event is Ontario's only WSER qualifier at the 100K distance — sub-18-hour finishers earn a ballot for the Western States Endurance Run lottery. Crew access at the start/finish after each loop, a bag drop station, and four fully stocked aid stations keep runners supported through the day and into the night.
Some ultra experience recommended
Hamilton, ON, CanadaMay 23, 2026
Sulphur Springs Trail Race 100K is a multi-loop trail race in Hamilton, ON, Canada, held on May 23, 2026. The course covers 100 km, climbs 2,600 m, and has a 30h cutoff.
This edition has its own course and we haven't mapped it yet. The interactive map, elevation profile and aid stations will appear here once the route is confirmed.
Aid stations for this edition aren't published yet. They'll appear here once the route is confirmed.
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