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Nearly 500 marathon courses.
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Ontario Marathons

Ontario has 16 active marathons this year. Races are most common in October, May, and June. Course terrain for these courses is most often mostly flat or rolling hills. Typical race day temperatures range from 36°F to 66°F.

Popular races include the Toronto Waterfront Marathon, Ottawa Marathon, and Toronto Marathon. 16 certified courses can be great Boston qualifier options. Races with the best Boston qualifying percentages include the Georgina Spring Fling Marathon — 25.4% BQ and Georgina Marathon — 25.4% BQ.

Browse by metro or city:

Ontario Marathons	Course	PR Score	Finishers	Reviews	Compare
St. Lawrence Marathon Cornwall, ON 04/25/2026	Mostly Flat 215 Finishers	PR Score	215 Finishers	Reviews	Compare Races
Mississauga Marathon Mississauga, ON 04/26/2026	Downhill 611 Finishers	PR Score	611 Finishers	Reviews	Compare Races
Georgina Spring Fling Marathon Georgina, ON 05/03/2026	Mostly Flat 236 Finishers	PR Score	236 Finishers	Reviews	Compare Races
Toronto Marathon Toronto, ON 05/03/2026	Downhill 2,975 Finishers	PR Score	2,975 Finishers	Reviews	Compare Races
Ottawa Marathon Ottawa, ON 05/24/2026	Rolling Hills 4,780 Finishers	PR Score	4,780 Finishers	Reviews	Compare Races
Sudbury Rocks Marathon Sudbury, ON 05/24/2026	Mostly Flat 73 Finishers	PR Score	73 Finishers	Reviews	Compare Races
Niagara Ultra Races Marathon Niagara-on-the-Lake, ON 06/20/2026	Rolling Hills 122 Finishers	PR Score	122 Finishers	Reviews	Compare Races
Community Strong Weekend Marathon Sault Ste. Marie, ON 06/21/2026	Mostly Flat 24 Finishers	PR Score	24 Finishers	Reviews	Compare Races
Georgina Marathon Georgina, ON 09/13/2026	Mostly Flat 434 Finishers	PR Score	434 Finishers	Reviews	Compare Races
That Dam Hill Marathon London, ON 09/19/2026	Mostly Flat 48 Finishers	PR Score	48 Finishers	Reviews	Compare Races
County Marathon Picton, ON 10/04/2026	Mostly Flat 194 Finishers	PR Score	194 Finishers	Reviews	Compare Races
Muskoka Marathon Bracebridge, ON 10/05/2025	Rolling Hills 302 Finishers	PR Score	302 Finishers	Reviews	Compare Races
Ottawa Fall Colours Marathon Ottawa, ON 10/11/2026	Rolling Hills 158 Finishers	PR Score	158 Finishers	Reviews	Compare Races
Toronto Waterfront Marathon Toronto, ON 10/18/2026	Mostly Flat 7,306 Finishers	PR Score	7,306 Finishers	Reviews	Compare Races
Niagara Falls International Marathon Niagara Falls, ON 10/25/2026	Mostly Flat 946 Finishers	PR Score	946 Finishers	Reviews	Compare Races
Hamilton Marathon Road2Hope Hamilton, ON 11/01/2026	Very Flat 693 Finishers	PR Score	693 Finishers	Reviews	Compare Races

VOTE FOR YOUR FAVORITE MARATHONS

VOTE FOR YOUR FAVORITE MARATHONS

Best Boston Marathon Qualifiers

It's here! Our annual list of the year'sbest marathons to help you qualify for the Boston Marathon.

2026 IS HERE!

Marathon Pace Bands

Run the Right Pace in Your Next Marathon

Nearly 500 marathon courses.Ships same or Next Day

Ontario Marathons

St. Lawrence Marathon

Cornwall, ON 04/25/2026

Mostly Flat

Elevation Chart

215 Finishers

99.28 PR Score

21.9%

Qualified

215 Finishers

21.9%

Qualified

Reviews

Compare Races

Mississauga Marathon

Mississauga, ON 04/26/2026

Downhill

Elevation Chart

611 Finishers

99.31 PR Score

10.0%

Qualified

611 Finishers

10.0%

Qualified

Reviews

Compare Races

Georgina Spring Fling Marathon

Georgina, ON 05/03/2026

Mostly Flat

Elevation Chart

236 Finishers

99.55 PR Score

25.4%

Qualified

236 Finishers

25.4%

Qualified

Reviews

Compare Races

Toronto Marathon

Toronto, ON 05/03/2026

Downhill

Elevation Chart

2,975 Finishers

99.60 PR Score

12.3%

Qualified

2,975 Finishers

12.3%

Qualified

Reviews

Compare Races

Ottawa Marathon

Ottawa, ON 05/24/2026

Rolling Hills

Elevation Chart

4,780 Finishers

98.24 PR Score

10.9%

Qualified

4,780 Finishers

10.9%

Qualified

Reviews

Compare Races

Sudbury Rocks Marathon

Sudbury, ON 05/24/2026

Mostly Flat

73 Finishers

--- PR Score

15.9%

It's here! Our annual list of the year's
best marathons to help you qualify for the Boston Marathon.

Nearly 500 marathon courses.
Ships same or Next Day

Cornwall, ON
04/25/2026

PR Score

Mississauga, ON
04/26/2026

PR Score

Georgina, ON
05/03/2026

PR Score

Toronto, ON
05/03/2026

PR Score

Ottawa, ON
05/24/2026

PR Score

Sudbury, ON
05/24/2026

PR Score

Niagara-on-the-Lake, ON
06/20/2026

PR Score

Sault Ste. Marie, ON
06/21/2026

PR Score

Georgina, ON
09/13/2026

PR Score

London, ON
09/19/2026

PR Score

Picton, ON
10/04/2026

PR Score