The Sulphur Springs Trail Race is a scenic and challenging ultra marathon held in Hamilton, Ontario, along the Niagara Escarpment. Established in 1992 as Canada's oldest ultra marathon, the event features a 20K loop course with groomed trails, rolling hills, and steep climbs.

Participants experience over 500m of elevation gain per loop and enjoy natural springs and streams throughout the course. The race serves as a Western States Endurance Run qualifying event and emphasizes sustainability, requiring participants to bring reusable cups or bottles.

- Over 500m (1,500 feet) of elevation gain per 20K loop
- Western States Endurance Run qualifier
- Cup-free event: participants must bring their own reusable cups or bottles
- No pets or strollers allowed in the event or start/finish area
- Aid stations offer variety but participants should bring specific dietary needs
- Poles permitted for distances 50 miles or longer