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Marathons Found In Ontario

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Marathons in Ontario 2025 - 2026

The most comprehensive list of Marathons in and near Ontario in 2025 - 2026. Find your perfect race!

Ontario's marathon landscape spans urban waterfront courses, rural countryside routes, and challenging Canadian Shield terrain. The full 42.2-kilometre distance showcases the province's diverse geography, from Toronto's lakefront to Ottawa's canal pathways and the rolling hills of wine country. The primary marathon season runs from April through November, with the largest events in spring and fall.

The province's signature marathon events reflect Ontario's varied environments. Toronto's waterfront routes offer predominantly flat courses ideal for Boston qualifying attempts, while Niagara's events incorporate dramatic escarpment views. Ottawa's canal system creates natural race corridors, and Muskoka's challenging routes wind through Shield country with significant elevation changes.

More Ontario Runs

Major City Running Events

Race Calendar: Marathons Found In Ontario

St Lawrence Marathon

Cornwall, ON
26 Apr 25
$45.82 - $100.28

Beneva Mississauga Marathon 2025

Mississauga, ON
27 Apr 25

Beneva Mississauga Marathon Volunteer Page

Mississauga, ON
27 Apr 25

Georgina Spring Fling 2025

Georgina, ON
04 May 25
$75.54 - $171.38

Run and Roll

Leamington, ON
04 May 25
$32.03

2025 Toronto Marathon

Toronto, ON
04 May 25

Turas MΓ³r 2025

Creemore, ON
10 May 25

Marathons For Mental Health 5k/10k Race

London, ON
24 May 25
$50.81 - $72.38

SudburyROCKS 2025

Greater Sudbury, ON
25 May 25
Free - $477.01

Community Strong Race Weekend

Sault Ste. Marie, ON
21 Jun 25
$15.20 - $66.98

The 2025 Perth World Record Kilt Run

Perth, ON
21 Jun 25
$7.64 - $1,081.24

Niagara Ultra 2025

Niagara-on-the-Lake, ON
21 Jun 25

Cooper Robertson Foundation – Run With Coops!

Grimsby, ON
03 Oct 25
Free - $20.00

2025 Muskoka Marathon

Bracebridge, ON
05 Oct 25
$24.02 - $143.84

2025 TCS Toronto Waterfront Marathon

Toronto, ON
18 Oct 25

2025 Women's Training Program

Toronto, ON
19 Oct 25
Free

U.S. & International Registrants, Niagara Falls 5k, 10k, Half & Marathon 2025

Niagara Falls, ON
26 Oct 25
$41.50 - $123.20

Niagara Falls 5k, 10k, Half & Marathon 2025

Niagara Falls, ON
26 Oct 25
$41.50 - $128.64

2025 Hamilton Marathon Road2Hope

Hamilton, ON
01 Nov 25
$1.00 - $10.00

Run to End Child Hunger

Toronto, ON
31 Dec 25
$40.00
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