Marathon directory
Marathons in Ontario, Canada
1 upcoming marathon listed in Ontario across 1 city. Next: TCS Toronto Waterfront Marathon on October 18, 2026.
1marathon upcoming
1city
October 18, 2026Next race
Marathon, Half marathon, 5KDistances
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Cities listed in Ontario
Cities
| Place | Marathons |
|---|---|
| Toronto | 1 |
Planning notes for Ontario, Canada
Use this region page to shortlist 1 upcoming race by date, distance, registration path, and official source.
- Next raceTCS Toronto Waterfront Marathon on October 18, 2026
- Busy monthsOctober (1)
- DistancesMarathon, Half marathon, 5K
- VerifyOpen each race page, then confirm details from its official, registration, course-map, or source link.