Ontario, Canada · Marathon
Marathons in Ontario, Canada
Ontario, Canada currently has 6 upcoming marathons with a confirmed date listed in RaceRove. Mississauga, Georgina, Hamilton and Sault Ste. Marie have the largest concentration of events.
Another 3 annual marathons are waiting for next year's date to be announced.
- Upcoming, date confirmed
- 6
- Active listings
- 9
- Cities with races
- 7
More ways to browse Ontario, Canada
Upcoming marathons in Ontario, Canada
All 6 with a confirmed date, soonest first.
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Beneva Mississauga MarathonMississauga, ONBeneva Mississauga MarathonElectrolit Half MarathonMississauga 10KMississauga 5K Run/Walk +2 more
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Georgina Spring FlingGeorgina, ONSpring Fling MarathonSpring Fling Half MarathonSpring Fling 10km run/walkSpring Fling 5km run/walk
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Community Strong Race WeekendSault Ste. Marie, ONBP 61KM ChallengeKids Fun RunColour Run10 Km +2 more
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TCS Toronto Waterfront MarathonToronto, ONGuideIn-Person MarathonIn-Person Half MarathonIn-Person 5K +9 more
Dates come from each race's own listing. Always confirm on the organiser's site before you book travel.
When marathons happen in Ontario, Canada
- April
- 2 upcoming races
- May
- 1 upcoming race
- June
- 1 upcoming race
- October
- 1 upcoming race
- November
- 1 upcoming race
Ontario cities with the most marathons
- Mississauga
- 2 upcoming races
- Georgina
- 1 upcoming race
- Hamilton
- 1 upcoming race
- Sault Ste. Marie
- 1 upcoming race
- Toronto
- 1 upcoming race
Annual events awaiting their next date
These marathons are held every year, but the next date isn't in the listing yet. The month shown is when each is usually held.
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The County MarathonPrince Edward, ON Usually held in October · next date not announcedHalf Marathon2-5 Person Marathon Relay Team5K RunFull Marathon +1 more ~1,600 runners
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Niagara Falls 10k, Half & MarathonNiagara Falls, ON Usually held in October · next date not announcedNiagara Falls Marathon - October 25Half-Marathon - October 2510K - October 25
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U.S. & International Registrants, Niagara Falls 10k, Half & MarathonNiagara Falls, ON Usually held in October · next date not announcedNiagara Falls MarathonHalf-Marathon10K
Marathons in nearby provinces and territories
Guides from the RaceRove blog
- 8 min read How to Choose Your First Marathon A practical checklist for choosing a first marathon based on course, weather, cutoff, travel, field size and support.
- 7 min read How to Find a 5K, 10K, Half Marathon or Marathon Near You A practical way to find running races near you: pick a distance, decide how far you'll travel, read the listing properly and confirm the details before you register.
- 4 min read Diplo's Run Club 2026-27: Every City, Date and Course Diplo's Run Club is a 5K with a post-race concert. Every US date for 2026-27 (San Francisco, New York, Los Angeles, San Diego and Phoenix), start times and courses.
- Blog All guides Planning advice for finding, choosing and travelling to races.
Marathons in Ontario, Canada: common questions
- How many marathons are there in Ontario, Canada?
- RaceRove currently lists 6 upcoming marathons in Ontario, Canada with a confirmed date, plus 3 annual events whose next date hasn't been announced yet.
- How long is a marathon?
- A marathon is 26.2 miles (42.2 kilometres).
- Which Ontario cities have the most marathons?
- By upcoming events listed in RaceRove: Mississauga (2), Georgina (1), Hamilton (1), Sault Ste. Marie (1) and Toronto (1).
- What is the biggest marathon in Ontario, Canada?
- By estimated field size, the largest event with a marathon listed in Ontario, Canada is the The County Marathon, with about 1,600 runners across all of its distances.
Search every marathon in Ontario, Canada
Filter by month, course profile and field size, save races to a shortlist and compare them side by side in the interactive search.